Republicans just took back control of the House and, at least right now, they're in a strong position to retake the Senate in two years, according to an analysis of the 2012 Senate field by political scientist Larry Sabato.
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As Sabato points out, the Democratic caucus currently holds 23 of the 33 Senate seats that will be on the line in 2012, meaning they have much more to lose than the GOP. Democrats will have to play a lot more defense and hope for help in the form of a strong down ticket effect from President Obama.
Also worrisome for Democrats, Sabato rates seven of those seats, six of them now in Democratic hands, as toss ups. If those races split four to three in favor of Republicans, and the two parties hold the rest of their seats, Republicans would swing their current 53-47 Senate minority into a 50-50 tie.