Races for Republican seats once considered as safe have tightened, potentially putting GOP strongholds in play.
8don MSN
Republican majority at risk? A look at the 6 GOP Senate seats most in jeopardy in midterm elections
Senate Republicans face tough midterm battles defending their 53-47 majority, with Maine's Collins and seats in North Carolina, Ohio most vulnerable.
The poll suggested that Republicans face an uphill path to flipping the seat vacated by retiring Democratic Senator Tina ...
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