On the eve of the first presidential debate, Barack Obama holds a four-point edge over Mitt Romney among likely voters nationwide. The president attracts 49 percent of the support to his GOP rival’s 45 percent, according to a Quinnipiac University survey released Tuesday. The RealClearPolitics average of national polls finds Obama with a 3.2 percentage point lead. Obama’s lead in the new survey appears to be buoyed by women voters, who back him over Romney by 18 points. Romney leads Obama by 10 points among men. Independent voters are virtually split between the two...

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