Here are Inside Elections' Senate race ratings.

Jon Tester has the most competitive race. If you are looking to donate to Democratic Senate races, he needs it the most.

Sherrod Brown in Ohio has been doing a bit better in polling than Tester. But state fundamentals are rough, so it may yet be a tough battle. He'll need a lot of split ticket voting and we are seeing that less and less with the Senate. Moreno is a pretty bad opponent, so he may get it.

Next weakest race is Slotkin in Michigan. She's not an incumbent, and non-incumbent polling has been weaker this cycle. But state fundamentals should help her.