The party is plowing some $100 million — nearly all of its Senate war chest — into reelecting eight senators in tough races. The few GOP candidates with a shot at picking off a Democratic seat have been left to fend for themselves, with no significant air cover from the national party for now…

“Right now, the Republicans have a pretty leaky boat, and they’ve got to figure which hole they want to stop up,” said J.B. Poersch, president of the Democratic super PAC Senate Majority PAC, which has spent $4 million in Michigan boosting Democratic Sen. Gary Peters. “Their problem right now is there’s more than one hole in the boat.”

Instead of going on offense in presidential battleground states where Democrats are defending seats, the party is instead focused on shoring up increasingly vulnerable incumbents in Georgia, Iowa and Montana. It’s all part of a strategy Republicans say is best designed to withstand the national headwinds and maintain the majority.