CEDAR RAPIDS — New Jersey Senator Cory Booker kicked off a two-day swing through Iowa with a stop in Mason City Friday morning, but others seeking the Democratic nomination for president also made their way through Iowa over the weekend:

Massachusetts Senator Elizabeth Warren also campaigned in Iowa Sunday, less than 24 hours after she formally kicked off her presidential campaign. Warren told a Cedar Rapids crowd Donald Trump “may not even be president” in 2020.

“In fact, he may not even be a free person,” Warren said, to cheers.

Warren suggested Democrats shouldn’t respond to the latest “racist tweet” from Trump and, instead, focus on fixes for the nation’s political system.

“Our country’s at a dangerous moment…so the fact that you’re here, the fact that you want to engage in this, the fact that you want to hear the details, you want to tell what you think is important here really matters,” Warren said.

South Bend, Indiana Mayor Pete Buttigieg, a potential candidate, campaigned here Friday and Saturday, mentioning the book he is releasing this week. Buttigieg described himself as a “non-traditional” candidate.

“Frankly, if you had asked me 10 years ago I would have believed that either you could be out or you could be in politics, not both and now I’m addressing a room full of people in Iowa about my hopes for our country with my husband looking on in the back of the room,” Buttigieg said, to applause from the gathering of Ankeny Democrats.

Buttigieg said there’s an appetite for something new in the Democratic Party, but there has to be substance behind it.

“I think it’s a moment in the party where we’re deciding what the future is going to look like and so the wider range of ideas and styles and tones and messages we can have, the better,” Buttigieg told reporters.

Blair Spotts of Altoona once worked as an engineer for the City of South Bend, so Buttigieg was her boss and she said he’s the kind of candidate she’s looking for.

“Someone with new, fresh ideas, who isn’t necessarily been in politics their whole life,” she said before Buttigieg spoke in Ankeny, “so I don’t want a career politician.”

Buttigieg, who turned 37 last month, would be the nation’s youngest president. He has been South Bend’s mayor for seven years.