FILE - In this Sept. 30, 2012 file photo, President Barack Obama waves to supporters as he arrives at McCarran International Airport in Las Vegas. President Barack Obama has one mission heading into his first debate with Republican Mitt Romney: Don't screw things up. Less than five weeks from Election Day, Obama has political momentum and an edge in polls of the battleground states that will determine the election. But he's expected to face a blistering challenge from Romney, who needs to use Wednesday's debate in Denver to change the trajectory of the race. (AP Photo/Isaac Brekken, File)

Associated Press
FILE - In this Sept. 30, 2012 file photo, President Barack Obama waves to supporters as he arrives at McCarran International Airport in Las Vegas. President Barack Obama has one mission heading into his first debate with Republican Mitt Romney: Don't screw things up. Less than five weeks from Election Day, Obama has political momentum and an edge in polls of the battleground states that will determine the election. But he's expected to face a blistering challenge from Romney, who needs to use Wednesday's debate in Denver to change the trajectory of the race. (AP Photo/Isaac Brekken, File)
FILE - In this Sept. 30, 2012 file photo, President Barack Obama waves to supporters as he arrives at McCarran International Airport in Las Vegas. President Barack Obama has one mission heading into his first debate with Republican Mitt Romney: Don't screw things up. Less than five weeks from Election Day, Obama has political momentum and an edge in polls of the battleground states that will determine the election. But he's expected to face a blistering challenge from Romney, who needs to use Wednesday's debate in Denver to change the trajectory of the race. (AP Photo/Isaac Brekken, File)
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