Scott Brown is perfect for all three of the Republicans left. He rallies Trump and Kasich types, uniting that branch, which is crucial for all three of them.
Ron Wyden and Al Franken seem like the best choices for Hillary. I think Evan Bayh or Martin O'Malley would be good picks for Sanders.
Brown? A pro-choice former half-term Senator from a non-swing state? (Although I guess he's from New Hampshire nowadays, but I'm not sure how much power that has when he lost his only election there.)
Also I think Hillary needs to pick someone under 60. While I think the Democrats are very much favorites to win, running a senior citizen ticket won't do them any favors.
