Some voters are a lot more complicated than is commonly understood, a new Pew Research Center study suggests. In Denver, an election worker collects a mail-in ballot from a voter on Tuesday. Ed Andrieski/AP hide caption

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President Obama, pictured here with Lilly Ledbetter, and congressional Democrats are working the equal pay issue hard in a midterm election year when they will need as many women to vote as possible. Carolyn Kaster/AP hide caption

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Rep. Tammy Duckworth, D-Ill., and Rep. Ron Barber, D-Ariz., right, pick up box lunches on Feb. 12 before boarding a bus for a trip to a retreat in Cambridge, Md., where House Democrats will hold strategy meetings for two and a half days. J. Scott Applewhite/AP hide caption

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The four lawmakers who were, but weren't, there at the time. (We put the oval around them to make them easier to see.) Rep. Nancy Pelosi's Facebook page hide caption

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Fiscal Cliff Compromise: Devil Is In The Definition Of Revenue

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Sen. Jon Tester, D-Mont., receives a kiss from his grandson Wednesday in Great Falls, Mont. Tester won re-election in a tight contest with Republican Rep. Denny Rehberg. Michael Albans/AP hide caption

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The Last Pew Poll: Obama Holds Edge On Eve Of Election

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