A young supporter of US Democratic presidential candidate Barack Obama has a sticker of Obama pasted on his cheek as he arrives with his father at Grant Park on election day, November 4, 2008 in Chicago, where Obama is to address a rally expected to be attended by more than one million people. Americans are voting in an election of rare historic potential, with front-running Obama seeking to become the first black president and Republican John McCain hoping for a poll-defying comeback. Getty Images logo Getty Images 12 months ago

A young supporter of US Democratic presidential candidate Barack Obama has a sticker of Obama pasted on his cheek as he arrives with his father at Grant Park on election day, November 4, 2008 in Chicago, where Obama is to address a rally expected to be attended by more than one million people. Americans are voting in an election of rare historic potential, with front-running Obama seeking to become the first black president and Republican John McCain hoping for a poll-defying comeback.