The 9 battleground states are so diverse that movement among demographic could change the election.
Obama is struggling in states where he was most dependent on support of whites--except for Ohio.
But an increasingly diverse electorate ensures a tight race.
Will last night's debate move the polls?
Democrats appear poised to capitalize on their registration advantage in Nevada, making Romney's route to victory much more difficult.
Actually, it's Romney who may want to start spending less money in Florida.
Obama loses about 4 points
Obama's struggling just about everywhere that he did well among Bush voters.
Republicans can overcome Democratic early voting efforts on Election Day.
Although Ohio is close, Obama's lead is relatively clear.