The Gallup/USA Today poll found 56 percent of those queried said they expect Obama to win, compared to 36 percent who said they expect presumptive Republican nominee Mitt Romney to come out on top.
At the same time, Gallup's daily tracking poll indicated voters were evenly divided on their preferences, with 46 percent favoring Obama and 45 percent, Romney.
"It is unclear why Americans are more inclined to predict an Obama than a Romney victory when the two are essentially tied in Gallup's latest election polling. It may be that Americans recognize the advantages Obama has as the incumbent and that historically, presidents seeking re-election usually win," Gallup said.
The Gallup/USA Today poll conducted last Thursday through Sunday queried 1,012 adults nationwide. The margin of error was 4 percentage points. The daily tracking poll was conducted last Tuesday through Sunday among 3,146 registered voters. It had a margin of error of 2 percentage points.
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