Sen. Chris Van Hollen, D-Md., predicted this week the new Republican tax cuts taking effect this year will take far too long to get to people, and that they therefore won't help Republicans in the 2018 midterm elections.
"It's called trickle-down [economics] for a reason," Van Hollen told the Washington Examiner.
But even if Republicans can keep voters focused on tax cuts, Van Hollen said Democrats have other reasons to be optimistic.
"The good news is we've got a lot of energy and momentum in support of Democrats," Van Hollen said, pointing to the result in the Alabama Senate contest where Sen. Doug Jones, D-Ala., defeated Judge Roy Moore.
In Arizona, both Rep. Martha McSally and former Maricopa County Sheriff Joe Arpaio announced their campaigns on the GOP side.