"Three Senate Democrats from states where Obama lost in 2012 – and who are up for reelection themselves in 2014..."

"... voted this week against their own party's fix for the 'sequester.' Will such votes hamstring Obama's legislative agenda?"

The GOP's Mitt Romney carried seven states where Senate Democrats will be up for reelection come 2014. Democrats are going to need to protect many of those to keep their Senate majority.