The last opportunity in this election cycle for tea party supporters to oust Republican senators arrives with primary elections in Kansas on Tuesday and Tennessee on Thursday.
Democrats, meanwhile, will confront their own party infighting on Saturday in Hawaii.
The Republican divisions have defined the midterm cycle and the contests this week will largely draw those electoral wars to a close for now.
In Kansas, Milton Wolf, a doctor who is running as an outsider, will try Tuesday to topple Sen.
Both campaigns have stumbled in a state that has veered to the right in recent years. Wolf, who has attacked President
Neither the race in Kansas -- nor Thursday's contest in Tennessee -- have seen the influx of outside spending that poured into other tea party battlegrounds, and both states are likely to return
In Tennessee, two-term Sen.
Despite the high hopes of tea party groups, most of their efforts to oust Republican senators this year have fizzled -- with the exception of the continued standoff in Mississippi, where tea party favorite
In fact, the most notable upset of the primary calendar drew scant attention from national tea party groups -- the toppling of House Majority Leader
The splintering of the GOP at a time when Republicans are trying to net six seats to take control of the Senate has caused hand-wringing among some party leaders.
"I'm not one of these people that buy into the theory that primaries are bad," Priebus said in a recent interview on Capitol Hill. "I think primaries can actually make candidates stronger."
Democrats have largely avoided a similar level of party infighting, except in Hawaii, where Sen.
Abercrombie's decision to pick Schatz, who at the time was lieutenant governor, also contributed to the governor's own primary challenge Saturday.