Republicans started this election cycle as heavy favorites to keep their Senate majority, with a lineup of elections mostly in red-tinted states and GOP incumbents favored over a slate of relatively unknown and untested challengers.

Now,nearlysixmonthsoutfromtheelection, Democrats are making them sweat.

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Republicans are still more likely than not to maintain control, butDemocrats strengthened their hand withaslate of challengers raising massive sums of money in races that represent the heart of the battle for the majority, putting control of the Senate within reach. Republicans remain modestfavorites to keep the Senate, with incumbents holding cash advantages in most competitive races and several offensive targets potentially cushioning their majority.

"The sense is that, no matter what else happens, we've got to hold the Senate majority. And it's not a given. There's just a broad front to defend."

Steven Law, president of the super PAC Senate Leadership Fund

"We'd be absolutely ridiculous not to recognize what's coming our way."

Jeff Kaufmann, the GOP chairman in Iowa

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