Maybe? The image of the Democrats and their legislation being popular and successful could help them a lot as well.
"Trump plus dems" would be exactly the message that Heitkamp, Tester, Donnelly, Manchin and McCaskill need. Could only help Brown, Baldwin, and Casey too (though i was never really worried about them).
A few non-shitty Trump wins delivered with help from moderate Dems would be huge for them and defuse the natural 2018 narrative for their Republican opponents (that they're standing in the way of Making America Great Again).