Welcome to Poll Watch, our weekly look at polling data and survey research on the candidates, voters and issues that will shape the 2020 election.

House Democrats insist they are leading an impeachment inquiry into President Trump for one simple reason: His actions have left them no other choice.

The president and his Republican allies argue that the inquiry is just an attempt to tear him down — “an illegitimate sham partisan process,” as the White House press secretary, Stephanie Grisham, put it on Wednesday.

But with the first round of public hearings wrapped up and another scheduled for Wednesday, which message is sticking across the country?