Former Maryland Gov. Martin O’Malley got three percent in the poll, with former Sen. Jim Webb at two percent and former Rhode Island Gov. Lincoln Chafee at 1 percent.

Bloomberg reported that Sanders’ rise in Iowa is powered by enthusiasm from first-time and young caucus-goers.

Saturday’s poll found that 43 percent of voters attending their first caucus in 2016 would pick Sanders, compared with 31 percent who would back Clinton.

It also found that 50 percent of Iowa Democratic voters under 45 support Sanders. Of that group, 27 percent say they support Clinton and 8 percent Biden.

Most respondents are picking Sanders because they are excited by the Vermont lawmaker’s ideas, not just opposed to Clinton, the poll said.

An overwhelming 96 percent said Sanders’ ideas had won them over, versus 2 percent who pick him based on objections to Clinton.

Clinton is the current front-runner for the 2016 Democratic presidential nomination across multiple polls.

The latest RealClearPolitics average of polls finds her with 47.8 percent and Sanders, her closest completion, at 26.3 percent.

Clinton’s momentum is fading, however, amid voter concerns over her transparency and trustworthiness while serving at the State Department.

At issue is Clinton’s use of a private email server during her tenure at the agency. Critics say the device may have prevented accountability of her service there and jeopardized sensitive national intelligence.

Clinton has repeatedly argued she used the email server for convenience without exposing any national security information to prying eyes.

She announced earlier this month that she is turning the device and its backup thumb drive to Justice Department investigators.