Quinnipiac’s latest survey of likely Iowa Democratic caucus-goers shows Senator Bernie Sanders cutting into former Secretary of State Hillary Clinton’s lead. The front-runner is ahead by 52 percent to 33 percent, compared to 60 percent for Clinton and 15 percent for Sanders in the previous Iowa Q-poll, released in May. The memo, results, and questionnaire for the latest survey are here. Vice President Joe Biden, who is very unlikely to run for president again, placed third with 7 percent support. Rounding out the declared Democratic field, former Governor Martin O’Malley registered 3 percent, former Senator Jim Webb 1 percent, and former Senator Lincoln Chaffee did not even reach the 1 percent mark among Quinnipiac’s respondents. Click here for more details on the sample and methodology. Live interviewers polled 761 likely Iowa Democratic caucus-goers between June 20 and 29, producing a statistical margin of error of plus or minus 3.6 percentage points.

The person who should be most worried about this poll is O’Malley. Sanders has firmly occupied the niche of progressive alternative to Clinton–not just in New Hampshire, where he is better-known as a neighboring state’s senator, but across the country. I’ve seen speculation that O’Malley could position himself as a more electable alternative to Clinton than Sanders. But any Democrat concerned primarily about electability will probably vote or caucus for Clinton. Quinnipiac’s Iowa Democratic respondents still view her positively: 85 percent favorable, 10 percent unfavorable. So Sanders isn’t riding an anti-Hillary wave; rather, he has stronger appeal among liberals.

Any comments about the Democratic presidential race are welcome in this thread. Last weekend, I saw a fun example of the Iowa caucus-goer mentality when a local acquaintance on vacation in New England posted to Facebook photos from a Sanders rally she attended in New Hampshire.