Democratic Senate candidates in key 2014 primary states have two big concerns right now: one is what kind of Republican gets the GOP nomination and the other is Americans for Prosperity. And it's the second that might be a bigger problem for Democrats this fall.
The group has continually hit red-state Senate Democrats -- not just on Obamacare but also on topics important to their respective states. Recently the group released a new ad hitting Sen. Mark Begich (D-AK) on the environment.
Unlike virtually every other conservative outside group that's spent most of 2014 fueling one side of the GOP Civil War, Americans for Prosperity -- backed by the wealthy billionaire brothers David and Charles Koch -- has acted like the adult in the room, pouring money into attacking the presumptive Democratic candidates. This tactic has kept Democrats in a more defensive crouch than what would normally happen while an opposing party's primary rages on.
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