Hillary Clinton and Bernie Sanders' former campaign managers, Robby Mook and Jeff Weaver, argue in a memo obtained by CNN that the GOP's effort to overhaul tax reform has given Democrats a "golden opportunity" to get ahead in "just about every demographic."

Why it matters: Senate Republicans are set to pass their tax bill later today, which would be a major legislative win for the GOP going into the 2018 midterm elections.

What they're saying: "It is quite a feat for Republicans to have designed a bill that could alienate Obama-Trump voters, Romney-Clinton voters and base Democrats all at the same time, but the tax plan achieves exactly this trifecta," they write. "...If Democrats properly seize this issue, they can potentially win over most every swath of the electorate critical to next year's midterm elections."

Mook and Weaver's argument: