Sen. Bernard Sanders on Sunday said that America will see one of the biggest political upsets in U.S. history when Iowa voters make their Democratic pick for president in Monday’s caucuses.

The Vermont independent is polling only a few points behind presumed front-runner Hillary Rodham Clinton, the former secretary of state who is dealing with new questions about how she handled secret government information on her private email server.

Mr. Sanders has decided not use the email issue as a cudgel against Mrs. Clinton. But he insisted that his platform against a “rigged economy” and a “corrupt campaign finance system” is resonating with young and working-class voters who won’t sit on the political sidelines any more.

The self-described democratic socialist has pledged to take on Wall Street and pursue a big-government platform of free public college tuition and single-payer, government-run health care.

“Our issues are out there. People are really enthusiastic,” Mr. Sanders told CNN’s “State of the Union.” “And if people come out to vote, I think you’re going to look at one of the biggest political upsets in the modern history of our country.”

Mr. Sanders has been cast as the Democratic counterpart to businessman Donald Trump, the GOP outsider who was dismissed at the start but now leads the Republican pack in Iowa.

“When we started this campaign here in Iowa, we were 50 or so points behind Secretary Clinton,” Mr. Sanders said. “We have come a long, long way.”

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