By | May 14 2012 12:13 PM

With Democrats defending nearly twice as many Senate seats as Republicans in 2012, the GOP has an excellent chance of taking the upper chamber and holding majorities in both houses of Congress. According to RealClearPolitics, or RCP, there are eight toss-up races that will dictate control of the Senate. Of those, independent Angus King is likely to win Maine, Democrat Bill Nelson is likely to win re-election in Florida, and Republican Dean Heller is likely to win Nevada's Senate race. That leaves the races in Massachusetts, Missouri, Virginia, Montana, and Wisconsin as the five races that will most likely tip the balance of power. My analysis and predictions are below.