A sign directs voters at a polling site in Atlanta. "Georgia is changing dramatically," Democratic gubernatorial candidate Jason Carter says. "There's no doubt that Georgia is next in line as a national battleground state." David Goldman/AP hide caption

itoggle caption David Goldman/AP

Republican officials Rob Collins, Phil Cox and Matt Walter all seemed pleased at a briefing for journalists about the GOP's midterm election prospects, as did former first lady Mamie Eisenhower. Frank James/NPR hide caption

itoggle caption Frank James/NPR

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

itoggle caption Ed Andrieski/AP

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

itoggle caption Carolyn Kaster/AP

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

itoggle caption J. Scott Applewhite/AP

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

itoggle caption Rep. Nancy Pelosi's Facebook page

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

itoggle caption Michael Albans/AP

Democratic presidential candidate George McGovern talks about the bombs being used in Vietnam at a $250-a-person fundraising dinner in Los Angeles on Sept. 27, 1972. AP hide caption

itoggle caption AP

Voters these days often reward politicians who sit at either end of the ideological spectrum while punishing those seen as compromisers. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Republican presidential nominee Mitt Romney meets audience members after he addressed the U.S. Hispanic Chamber of Commerce in Los Angeles on Monday. Charles Dharapak/AP hide caption

itoggle caption Charles Dharapak/AP