MIAMI -- President Obama, campaigning here for Hillary Clinton on Thursday, criticized Donald Trump’s assertion that he may not accept the results of next month’s election. 

“That is not a joking matter, no no no, I want everybody to pay attention here, that is dangerous. Because when you try to sow the seeds of doubt in people’s minds about the legitimacy of our elections, that undermines our democracy. Then you’re doing the work of our adversaries for them,” Obama said.

Obama also praised Clinton for her experience and hammered the integrity of Republicans, particularly Sen. Marco Rubio, who have maintained their Trump support. Rubio, who is up for re-election in November, has been leading his Democratic challenger, Rep. Patrick Murphy, in recent polls. 

“If you are a Republican official leader out there and you have run for office on family values...why wouldn’t you walk away from him months ago when you heard your nominee for President call women pigs and dogs and slobs,” Obama said. “You don’t have to be a husband or a father to stand up for women.”

Early voting on Florida begins on Monday, and Obama suggested the crowd cast ballots soon to “reject somebody who proves himself unfit.”

Obama also touted Clinton’s experience as a senator and as his secretary of state and praised her even-headed approach to crises and steadfast commitment to diving into briefing books.

“She is not watching reality TV. She is not participating in reality TV. She is doing the work,” Obama said.

The event was at Florida Memorial University, one of Florida’s four Historically Black Colleges and Universities. Attendees said that his visit could drive more enthusiasm in Clinton’s direction. 

“I love him,” said Linda Blanc, a 22-year-old. Still, she sighs when she talks about Hillary Clinton even, though the registered Democrat will likely vote for her. 

Blanc said she has hesitations about Clinton’s record when it comes to Haiti and the way that President Bill Clinton acted in the White House.  

For his part, Obama tried to convince Floridians that Trump does not represent them.

“I know Trump hangs out here in Florida but I don’t think he represents the values of Florida,” Obama said to the crowd. “He is not part of he solution, he is part of the problem.”

The president tied the prospect of Clinton taking the White House to something greater.

“Progress is on the ballot. Civility is on the ballot. Tolerance is on the ballot. Justice is on the ballot. Equality is on the ballot. Our democracy is on the ballot,” Obama said. 

As he left the stage, the crowd roared.

“I touched Barack Obama, President of the United States! Oh, I love him,” declared Vivian Thomas, a 60-year-old Floridian as she shook and waved her hands in the air.