Nancy Pelosi

Some have invested a lot to get Nancy Pelosi back in the speaker’s chair. | AP Photo

By ALEX ISENSTADT | 1/29/14 9:00 PM EST Updated: 1/30/14 7:17 AM EST

With Democrats’ grasp on the Senate increasingly tenuous — and the House all but beyond reach — some top party donors and strategists are moving to do something in the midterm election as painful as it is coldblooded: Admit the House can’t be won and go all in to save the Senate.

Their calculation is uncomplicated. With only so much money to go around in an election year that is tilting the GOP’s way, Democrats need to concentrate resources on preserving the chamber they have now. Losing the Senate, they know, could doom whatever hopes Barack Obama has of salvaging the final years of his presidency.