Campaign 2016 Clinton: Democratic presidential candidate Hillary Clinton arrives at Eastern Iowa Airport in Cedar Rapids, Iowa, Friday, Oct. 28, 2016, to attend a rally.
Campaign 2016 Clinton: Democratic presidential candidate Hillary Clinton arrives at Eastern Iowa Airport in Cedar Rapids, Iowa, Friday, Oct. 28, 2016, to attend a rally.

President Barack Obama stumped for Democratic presidential candidate Hillary Clinton on Friday in Florida, calling on his young audience to stay focused and work toward a Democratic win in the November 8 election.

"I am going to work my heart out over these next 11 days," Obama said in his speech to a packed arena at the University of Central Florida in Orlando. "I don't know about you, but I'm not tired!"

He also noted that more supporters who were not able to fit into the arena's 10,000 seats were gathered outside.

WATCH: Obama Campaigns for Clinton in Florida

Obama encouraged his audience to vote early, but to keep working for a Clinton victory up until Election Day.

"You have a chance to shape history, so don't let that chance slip away," he said. He made no mention of the announcement Friday that the FBI was reopening an investigation into Clinton's emails, and also refrained from mentioning Clinton's Republican opponent, Donald Trump, by name. But he did draw a contrast between the two campaigns.

"This is the moment where America has to take a stand and decide what we believe in and who we are," he said. "We're not going to succumb to cynicism and life in fear. Instead, we're going to lift up hope."

Obama ended his spirited stump speech with an appeal to his young audience: "Let's go to work!"

Critical state

Florida is seen as a battleground state where the vote could go for either Clinton or Trump. The state has 29 electoral votes, making it an important player in the nation's final choice for president. A candidate needs at least 270 Electoral College votes to win the presidency.

WATCH: Clinton Speaks to Impact Email Probe May Have on Election

Earlier Friday, Clinton appeared in Iowa, where she said Trump was pursuing a "scorched earth" policy by trying to discourage Clinton supporters from voting.

While she campaigned, her campaign manager, John Podesta, addressed the breaking news that the FBI was reopening its investigation into Clinton's use of a private email server while serving as secretary of state. Podesta questioned the timing of the development and demanded the FBI release more information.

A Bloomberg poll released Wednesday put Trump 2 percentage points ahead of Clinton in a four-way race that included Green Party candidate Jill Stein and Libertarian Gary Johnson.

In 2012, Obama won Florida by less than 1 percentage point.

Meanwhile, Trump made appearances in the northeastern states of New Hampshire and Maine, where he congratulated the FBI for reopening its investigation and said the system "might not be as rigged" as he thought.

FILE - Donald Trump speaks during a rally in Toled
Republican presidential candidate Donald Trump speaks during a campaign rally in Toledo, Ohio, Oct. 27, 2016.

Earlier this week, Trump said he had personally spent $100 million on his campaign and was prepared to contribute more if he had to.

With the election race in its final two weeks, Clinton's campaign has outspent Trump's by more than a 2-to-1 margin.

Reports filed by the candidates with the U.S. government showed that Clinton had raised nearly $950 million and had about $178 million on hand for television advertising and get-out-the-vote efforts in the last days ahead of the election.  Trump's campaign has raised about $449 million and has $97 million on hand.

The government reports showed that 25 U.S. presidential candidates — Democrats, Republicans and minor party candidates — raised more than $1.2 billion in direct contributions to their campaigns, most of which began in late 2014 or last year. Independent committees have raised hundreds of millions more to support those campaigns.

In addition, candidates for seats in the Senate and House of Representatives have raised another $1.4 billion for their campaigns.