Slideshow: Presidential campaign homestretch

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President Barack Obama speaks at a campaign event Saturday, Nov. 3, 2012, in Milwaukee. (AP PhotoMorry Gash)
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Republican presidential candidate and former Massachusetts Gov. Mitt Romney reaches out to shake hands with supporters as he campaigns at Colorado Springs Municipal Airport in Colorado Springs, Col., Saturday, Nov. 3, 2012. (AP PhotoCharles Dharapak)
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President Barack Obama greets a cheering crowd as he arrives at a campaign event at the Fifth Third Arena on the University of Cincinnati campus, Sunday, Nov. 4, 2012, in Cincinnati. (AP PhotoCarolyn Kaster)
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Republican presidential candidate and former Massachusetts Gov. Mitt Romney greets supporters during a campaign rally at the International Exhibition Center in Cleveland, Sunday Nov. 4, 2012. (AP PhotoJerome Delay)
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Vice President Joe Biden gestures as he speaks during a campaign rally at Rushville Middle School, Sunday, Nov. 4, 2012, in Lancaster, Ohio. (AP PhotoMatt Rourke)
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Republican presidential candidate and former Massachusetts Gov. Mitt Romney with his wife Ann greet supporters during a campaign rally at the International Exhibition Center in Cleveland, Sunday Nov. 4, 2012. (AP PhotoJerome Delay)
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President Barack Obama is seen on a video tablet as he shakes hands after speaking at a campaign event Saturday, Nov. 3, 2012, in Milwaukee. (AP PhotoMorry Gash)
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Republican presidential candidate and former Massachusetts Gov. Mitt Romney greets supporters during a campaign rally at the International Exhibition Center in Cleveland, Sunday Nov. 4, 2012. (AP PhotoJerome Delay)
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Former President Bill Clinton speaks at a rally for Barack Obama at Pullen Park in Raleigh, N.C., Sunday, Nov. 4, 2012. The former president has been traveling to several battleground states over the past week to try to stem any Republican tide for Mitt Romney and preserve Obama leads. (APTed Richardson)
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Supporters of Republican presidential candidate and former Massachusetts Gov. Mitt Romney pray before the arrival of Romney during a campaign rally at the International Exhibition Center in Cleveland, Sunday Nov. 4, 2012. (AP PhotoJerome Delay)
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Women hold up signs spelling "vote" on a stage being prepared for a speech by President Barack Obama at a campaign rally at the Community College of Aurora, in Denver, Sunday, Nov. 4, 2012. (AP PhotoBrennan Linsley)
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Fireworks explode in the distance as Republican presidential candidate and former Massachusetts Gov. Mitt Romney walks on stage at a Virginia campaign rally at Newport News International Airport, in Newport News, Va., Sunday, Nov. 4, 2012. (AP PhotoCharles Dharapak)
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A supporter smiles as Vice President Joe Biden speaks during a campaign rally at Rushville Middle School, Sunday, Nov. 4, 2012, in Lancaster, Ohio. (AP PhotoMatt Rourke)
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Supporters cheer as Republican vice presidential candidate, Rep. Paul Ryan, R-Wis., speaks during a campaign event at the Douglas County Fairgrounds, Sunday, Nov. 4, 2012 in Castle Rock, Colo. (AP PhotoMary Altaffer)
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Vice President Joe Biden laughs during a campaign rally at Lakewood High School, Sunday, Nov. 4, 2012, in Lakewood, Ohio. (AP PhotoMatt Rourke)
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Republican presidential candidate and former Massachusetts Gov. Mitt Romney greets supporters at a Virginia campaign rally at Newport News International Airport, in Newport News, Va., Sunday, Nov. 4, 2012. (AP PhotoCharles Dharapak)
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Republican vice presidential candidate, Rep. Paul Ryan, R-Wis., and his wife Janna smile as their daughter Liza poses for a photo backstage before a campaign event, Sunday, Nov. 4, 2012 in Mansfield, Ohio. (AP PhotoMary Altaffer)
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President Barack Obama waves after speaking at a campaign event Saturday, Nov. 3, 2012, in Milwaukee. (AP PhotoMorry Gash)
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Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks to the crowd during a campaign event at the Newport News International Airport, Sunday, Nov. 4, 2012, in Newport News, Va. (AP PhotoDavid Goldman)
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President Barack Obama pauses as he speaks to supporters during a campaign event at Fifth Third Arena, Sunday, Nov. 4, 2012, in Cincinnati. (AP PhotoPablo Martinez Monsivais)
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President Barack Obama speaks at a campaign event Saturday, Nov. 3, 2012, in Milwaukee. (AP PhotoMorry Gash)
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Republican presidential candidate and former Massachusetts Gov. Mitt Romney reaches out to shake hands with supporters as he campaigns at Colorado Springs Municipal Airport in Colorado Springs, Col., Saturday, Nov. 3, 2012. (AP PhotoCharles Dharapak)
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President Barack Obama greets a cheering crowd as he arrives at a campaign event at the Fifth Third Arena on the University of Cincinnati campus, Sunday, Nov. 4, 2012, in Cincinnati. (AP PhotoCarolyn Kaster)
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Republican presidential candidate and former Massachusetts Gov. Mitt Romney greets supporters during a campaign rally at the International Exhibition Center in Cleveland, Sunday Nov. 4, 2012. (AP PhotoJerome Delay)
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Vice President Joe Biden gestures as he speaks during a campaign rally at Rushville Middle School, Sunday, Nov. 4, 2012, in Lancaster, Ohio. (AP PhotoMatt Rourke)
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Republican presidential candidate and former Massachusetts Gov. Mitt Romney with his wife Ann greet supporters during a campaign rally at the International Exhibition Center in Cleveland, Sunday Nov. 4, 2012. (AP PhotoJerome Delay)
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President Barack Obama is seen on a video tablet as he shakes hands after speaking at a campaign event Saturday, Nov. 3, 2012, in Milwaukee. (AP PhotoMorry Gash)
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Republican presidential candidate and former Massachusetts Gov. Mitt Romney greets supporters during a campaign rally at the International Exhibition Center in Cleveland, Sunday Nov. 4, 2012. (AP PhotoJerome Delay)
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Former President Bill Clinton speaks at a rally for Barack Obama at Pullen Park in Raleigh, N.C., Sunday, Nov. 4, 2012. The former president has been traveling to several battleground states over the past week to try to stem any Republican tide for Mitt Romney and preserve Obama leads. (APTed Richardson)
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Supporters of Republican presidential candidate and former Massachusetts Gov. Mitt Romney pray before the arrival of Romney during a campaign rally at the International Exhibition Center in Cleveland, Sunday Nov. 4, 2012. (AP PhotoJerome Delay)
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Women hold up signs spelling "vote" on a stage being prepared for a speech by President Barack Obama at a campaign rally at the Community College of Aurora, in Denver, Sunday, Nov. 4, 2012. (AP PhotoBrennan Linsley)
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Fireworks explode in the distance as Republican presidential candidate and former Massachusetts Gov. Mitt Romney walks on stage at a Virginia campaign rally at Newport News International Airport, in Newport News, Va., Sunday, Nov. 4, 2012. (AP PhotoCharles Dharapak)
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A supporter smiles as Vice President Joe Biden speaks during a campaign rally at Rushville Middle School, Sunday, Nov. 4, 2012, in Lancaster, Ohio. (AP PhotoMatt Rourke)
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Supporters cheer as Republican vice presidential candidate, Rep. Paul Ryan, R-Wis., speaks during a campaign event at the Douglas County Fairgrounds, Sunday, Nov. 4, 2012 in Castle Rock, Colo. (AP PhotoMary Altaffer)
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Vice President Joe Biden laughs during a campaign rally at Lakewood High School, Sunday, Nov. 4, 2012, in Lakewood, Ohio. (AP PhotoMatt Rourke)
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Republican presidential candidate and former Massachusetts Gov. Mitt Romney greets supporters at a Virginia campaign rally at Newport News International Airport, in Newport News, Va., Sunday, Nov. 4, 2012. (AP PhotoCharles Dharapak)
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Republican vice presidential candidate, Rep. Paul Ryan, R-Wis., and his wife Janna smile as their daughter Liza poses for a photo backstage before a campaign event, Sunday, Nov. 4, 2012 in Mansfield, Ohio. (AP PhotoMary Altaffer)
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President Barack Obama waves after speaking at a campaign event Saturday, Nov. 3, 2012, in Milwaukee. (AP PhotoMorry Gash)
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Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks to the crowd during a campaign event at the Newport News International Airport, Sunday, Nov. 4, 2012, in Newport News, Va. (AP PhotoDavid Goldman)
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President Barack Obama pauses as he speaks to supporters during a campaign event at Fifth Third Arena, Sunday, Nov. 4, 2012, in Cincinnati. (AP PhotoPablo Martinez Monsivais)

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