Obamacare, taxes ... " 2014 Senate Races Likely To Keep Democrats On The Defensive ... shows 12 Democratic seats that are potentially in play "

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GOOGLE the following article 
from the Huffington post, and see 
the vulnerable seats by name :

2014 Senate Races Likely To Keep 

Democrats On The Defensive ... 

" Twenty Democratic senators are up for reelection in 2014, compared to only 13 Republicans. Despite the Democratic successes the last time this group of senators was up for election in 2008, many of their seats are in Republican-leaning, or swing, states.

An initial analysis of the 2014 Senate races -- primarily based on the partisan leanings of each state and the perceived strength of the incumbents -- shows 12 Democratic seats that are potentially in play, compared with just two Republican seats that could be vulnerable, ensuring that Democrats will almost exclusively be playing defense in 2014. "