Note: All non-first choice preferences polling topline data, unless otherwise stated, is among in-person caucusgoers who will determine 90% of the delegate count.

Many Democratic candidates running for president are calling for, at a minimum, an impeachment inquiry against President Donald Trump. House Speaker Nancy Pelosi, on the other hand, wants to continue investigating the president through other means before opening an impeachment inquiry.

Our new poll suggests that Iowa likely Democratic caucusgoers are slightly more open to Pelosi's approach. A plurality (48%) said House Democrats ought to continue investigating the President rather than move forward on formal impeachment proceedings now. A minority (42%) said congressional Democrats would be shirking their constitutional duty if they do not move ahead on impeachment as soon as possible.

This lines up with what was generally found in CNN’s late April poll. Although the two options were asked in different questions, more Democrats said they were for investigating the president for obstruction of justice than those who said they were for impeaching and removing him from office.

When you break it down by different groups, there are some clear differences. Those under 45 years-old are far more likely to be for impeachment (49%) than those 45 years and older (35%). Biden supporters are nearly 10 points less likely to be for impeachment than the average.

But while liberals (46%) are slightly more likely to be for impeachment compared to moderates (41%), a plurality of both said they would rather go down the investigation route.