A new poll from Rasmussen Reports shows Newt Gingrich declining further in a hypothetical matchup against President Barack Obama. Among the 1,000 likely voters surveyed on December 12 and 13, 49 percent say they would vote for Obama while 39 percent would vote for Gingrich.

That ten-point difference is the largest between the two candidates, five points wider than the margin between Obama and Gingrich (45 percent to 40 percent) in last week's Rasmussen poll. At one point in late November, Gingrich had a slight lead on Obama, at 45 percent to 43 percent, according to the pollster.

According to the RealClearPolitics poll average, Gingrich is 8.4 percentage points behind Obama in a general election contest. Mitt Romney, by contrast, only trails Obama by 1.6 points.

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