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.

The Iowa presidential caucuses are usually a nail-biter.

But with a sardine-packed field of Democratic candidates and the Senate’s impeachment trial cluttering some of their schedules, clarity this year is especially scarce.

Two recent Iowa polls — one last week from Monmouth University and the CNN/Des Moines Register survey released a few days earlier — gave two differing pictures of the race. But both found that most of the state’s likely Democratic caucusgoers had not yet decided firmly on a candidate.

In each poll, only about two in five Democratic voters said they had reached a final decision. That’s an unusually low number, said J. Ann Selzer, who runs the CNN/Register poll — even though the state’s voters are known for their late decision-making.