In both cases, 50% of registered voters surveyed said they would support Obama, while 48% would back either Romney or Gingrich.
A main reason for the tight results, Gallup says: Negative votes against Obama.
"Most registered voters who back Obama indicate that their vote decision represents a vote for Obama rather than a vote against the Republican candidate," Gallup reports.
"By contrast," the survey adds, "voters supporting the Republican in each trial heat say their choice primarily represents a vote against Obama rather than for either Gingrich or Romney."
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