FILE - In this Sept. 7, 2012 file photo, people await the arrival of President Barack Obama, first lady Michelle Obama, and Vice President Joe Biden and his wife, Jill Biden, at a grass

 

              FILE - In this Sept. 7, 2012 file photo, people await the arrival of President Barack Obama, first lady Michelle Obama, and Vice President Joe Biden and his wife, Jill Biden, at a grass
FILE - In this Sept. 7, 2012 file photo, people await the arrival of President Barack Obama, first lady Michelle Obama, and Vice President Joe Biden and his wife, Jill Biden, at a grassroots campaign event at the University of Iowa. The question of whether race fuels opposition to Obama has become one of the most divisive topics of the election campaign, sowing anger and frustration among conservatives who are labeled racist simply for opposing Obama’s policies and liberals who see no other explanation for such deep dislike of the president. (AP Photo/Nam Y. Huh, File)