The election campaign's twilight hours

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A motorcycle police officer blocks an on ramp as Mitt Romney's motorcade passes by on October 23, 2012 in Denver, Colorado.Justin Sullivan / Getty Images

Oct. 24, 2012, 5:52 AM EDT

By PhotoBlog

President Barack Obama sits aboard Marine One as it lands on the South Lawn of the White House on October 23, 2012 in Washington, DC. Obama was returning from campaign events in Florida and Ohio.Alex Wong / Getty Images

Secret Service agents look on during a campaign rally for Republican presidential candidate Mitt Romney at the Red Rocks Amphitheatre on October 23, 2012 in Morrison, Colorado.Justin Sullivan / Getty Images

More election coverage from NBC Politics:

Romney shows confidence at Colorado rally
Obama renews ridicule of Romney the day after final debate
Slideshow: On the campaign trail
Slideshow: Swing state voters sound off
Slideshow: Twin sons of different parties

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