Democrats doubled their lead over Republicans to six points in December on the Generic Congressional ballot. Rasmussen Reports national telephone surveys found that 43% of voters said they would vote for their district’s Democratic candidate while 37% said they would choose the Republican.

In November, Barack Obama’s party held just a three-point lead, despite a dominating performance on Election Day that included winning much larger majorities in both the House and the Senate.

During the final week polled in December, Democrats held an eight-point lead, their largest since mid-October.

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Over the past year, Democratic support has ranged from a low of 43% to a high of 50%. Over that same time period, Republicans have been preferred by 34% to 41% of voters nationwide.

Men still favor the Republicans by a 40% to 38% margin, while women prefer Democrats by a 47% to 34% margin.

Unaffiliated voters now lean toward the GOP 32% to 28%, with another 30% undecided.

Voters with children living at home are almost evenly divided, favoring the Republicans slightly more - by a 40% to 39% margin. Those with no children living at home prefer the Democrats, 45% to 35%.

Forty-one percent (41%) of married voters say they would vote Republican, while 37% would vote Democratic. Non-married adults prefer the Democrats by a two-to-one margin.

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