From the article.
The poll results come as Trump faces criminal investigations in both Washington, D.C., and New York related to whether his campaign coordinated with Russian officials and actors to help sway the 2016 presidential election.At the same time, federal prosecutors implicated Trump earlier this month in a separate case related to payments made to two women to keep them quiet about affairs they say they had with him.
In a memo recommending a prison sentence for Trump’s former personal lawyer, Michael Cohen, federal prosecutors said Trump directed the payments to the two women to ward off a potential sex scandal as he sought the White House in 2016. Those payments, prosecutors argue, amounted to illegal contributions to the real estate mogul’s campaign. U.S. voters are near-evenly divided on whether the payments warrant impeachment, according to the Harvard CAPS/Harris poll.
Forty-nine percent of voters polled said they favor trying to impeach Trump over the allegations, while slightly more — 51 percent — said that doing so would return the country to 1998, when then-President Clinton faced impeachment proceedings on two charges related to an affair with Monica Lewinsky, a former White House intern.
The article quotes you provided, still don’t answer the question:
“What crime did Trump commit for which he should be impeached?”
The crimes pointed out, are NOT IMPEACHMENT-WORTHY.