Democrats needed to pick up 25 Republican seats to regain control. Most experts see between 50 and 60 races are key; two years after the tea party propelled historic midterm shift, few in GOP claim that mantle.
Voting booths stand at the ready at Public School 188 in New York City, one of the thousands of places which will be used as a polling center in Tuesday's Presidential election.
President Obama has spent the past 48 hours in seven states -- three time zones -- surrendering sleep and voice in pursuit of a second term. Mitt Romney is on a similar tour, working four swing states Monday to make up those paper-thin deficits.
States will vote on nearly 180 ballot measures in 2012. Same-sex marriage, abortion, the death penalty and health care reform are up for a vote. Special interest groups and wealthy private donors invest heavily in ballot initiatives.
One close vote scenario: absentee, mail-in, and provisional ballots could delay tally in Ohio. Buckeye State has among the highest provisional ballot rates -- about 200,000 cast in 2008.
Mitt Romney and Barack Obama neck-and-neck in polls. Winning the popular vote doesn't guarantee the White House, and the winner of the most votes has actually lost four times before.
In a late campaign push to change the battleground map, Mitt Romney will travel to Pennsylvania on Sunday in the hopes of capturing the traditionally Democratic-leaning state.
The governor led a rally of Republicans in Topeka Tuesday to finish the election season strong. He plans to ride a motorcycle with the Road Map for Growth Tour to 11 stops in Kansas Thursday and Friday.