NEW YORK (CBSNewYork) — While Mayor Bill de Blasio was campaigning for Hillary Rodham Clinton in Iowa, Bernie Sanders supporters took to the streets of Manhattan on Saturday.

About 1,000 people carrying signs supporting the Democratic senator from Vermont marched from Union Square to Zuccotti Park, WCBS 880’s Ginny Kosola reported.

“It’s good to show that there’s a real presence of Bernie supporters in the city,” said William, of Chelsea.

Paul, of Brooklyn, said they are sending a message to Iowa.

“Hopefully it does help in some tiny way, and it’s fun to do,” he said.

Leon, of Harlem, said he is not surprised The New York Times endorsed Clinton for the Democratic nomination Saturday.

“It wasn’t disappointing,” he said. “I think a lot of Hillary Clinton’s endorsements are establishment endorsements.”

The march was rescheduled from last weekend because of the snow.

On the eve of the Iowa caucuses, candidates for both the Democratic and Republication nomination rallied in Iowa, CBS2’s Weijia Jiang reported.

Colin Baldwin was one of 15,000 supporters spreading the word in Iowa on behalf of Sanders.

“It’s brick by brick one call at a time, knocking on one door at a time,” Baldwin said.

On Sunday, the Sanders campaign announced it raised $20 million this month alone. Over the last three months of 2015, Sanders raised $33 million compared to Clinton’s $37 million.

Marvin Miller showed up to Donald Trump’s headquarters in Des Moines to help out. He’s a registered Democrat, but plans to jump ship for the Republican frontrunner.

“I just like the man,” Miller said. Everybody else. Not so much.”

In the latest poll, Trump holds a 5-point lead over Ted Cruz, with Sanders and Hillary Clinton neck and neck within the margin of error.

According to political experts, volunteers should not be trying to change people’s minds, but should focus on making sure already committed voters actually show up on caucus night.

“It’s not like you can absentee ballot, you have to physically show up,” one Hillary Clinton supporter said.

Voters will meet on Monday night to make the first decisions in the race for the White House.