Tilt Democratic. The winner will probably get less than 50%.
Republicans can’t beat a Democratic Senator in a Trump +42 state while the last blue state Republican with a history of winning absolute landslides is trailing in a Clinton +3 state. I’d say any "asymmetric electoral polarization" in blue vs. red states more than negates the Democrats' "small state problem" in the Senate.
That said, I’m not going to move it to Lean D because of this particular "Term Limits" poll, especially when other recent polls have indicated a much closer race. It’s obvious that Collins is in big trouble, though.
The "small state problem", however, doesn't change just because Democrats run better candidates. And I'm not even saying the senate should be made up differently, even though Puerto Rico and DC should be granted statehood.