Senate GOP candidates might not be doing as well as everyone thought: “The new round of October polling from the Senate Leadership Fund shows all but one Republican candidate running behind Donald Trump in battleground states,” per an internal memo reported on by Politico. There are currently open seats in Michigan, Maryland, and Arizona, plus the West Virginia (where Republican Jim Justice is up against Democrat Glenn Elliott) and Montana (where Republican Tim Sheehy is up against Democratic Sen. Jon Tester) races look quite good for them. “But other pickup opportunities, namely Maryland and …