AARON BLAKE: This poll is a warning sign for Democrats.

A new Washington Post-ABC News poll, as Mike DeBonis and Emily Guskin report, presents a pretty mixed bag for Democrats. It shows that registered voters say they want Democrats to control Congress to be a check on Trump by a 52-38 percent margin, but it also shows Democrats are — rather remarkably — less enthusiastic about voting than Republicans are. While 65 percent of Republicans and GOP-leaning adults say they are “almost certain to vote,” just 57 percent of Democrats and Democratic-leaning adults say the same.

The question from there is which is more predictive of what lies ahead. And the answer won’t necessarily make Democrats feel better.

Great, kid — don’t get cocky.