FILE - Election 2020 Pete Buttigieg

Democratic presidential candidate South Bend, Ind., Mayor Pete Buttigieg.

A new poll from Iowa State University shows South Bend Mayor Pete Buttigieg pulling ahead of the pack in Iowa's first-in-the-nation caucuses.

The poll has Buttigieg as the top choice of 26 percent of respondents. U.S Sen Elizabeth Warren is second with 19 percent, followed closely by U.S. Sen. Bernie Sanders with 18 percent.

Former Vice President Joe Biden is a distant fourth at 12 percent.

“Warren has seen heightened scrutiny this past month, while Buttigieg has received mostly positive attention,” Dave Peterson, a professor and Whitaker Lindgren faculty fellow in political science at Iowa State, said in a news release. “A little over 60% of the people who supported Warren in October still support her now, and those who switched went to Buttigieg.”

Peterson organized the poll.

The poll of 614 likely Democratic caucus-goers was conducted Nov. 15-19 and asked voters to name their first and second choices.

“What this tells me, is that there is a segment of Iowans backing the candidate getting the most positive coverage,” Peterson said. “If we start seeing more scrutiny of Buttigieg, then his lead might prove to be temporary as well.”

Warren, Biden and Sanders form the top three of most national polls.