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Labor unions. And they're doing it through a pro-business Republican PAC.
Six-term incumbent likely to face stiff opposition in primary.
The Massachusetts senator has become a litmus test for candidates seeking to claim the progressive mantle in 2014.
GOP spokesman's questioning of Mark Pryor's faith causes uproar—from fellow Republican's campaign.
Trying to define himself early, Mark Pryor turns to his faith.
Exit Nancy Pelosi. Enter Harry Reid.
The conservative base ensures GOP candidates will support only repealing Obamacare. That's good news for Democrats.