Joe Manchin - coal. Heitkamp - fracking. Re-election year 2018 and 2018. In 2019, if they are still in the Senate, they will return to the fold. And they are given permission to vote their intelligence on this one issue, although Manchin votes intelligently more often than that.
Manchin will be. Heitkamp, not too sure. Burned a lot of bridges. Another to see go is Tester from Montana and quite possibly Nelson of Florida. The pubbies could end up with a huge majority in the Senate.