The Democratic candidate barnstormed through populous southeast Florida, visiting Fort Pierce and Coral Springs, trying to rally reenergized supporters and boost her campaign war chest.
Florida, with its prodigious number of electoral votes, has swung back toward Clinton since Monday's first presidential debate, polling shows, offering her a tantalizing opening to reach the White House.
A Clinton victory in just two battleground states -- Florida and Pennsylvania -- would leave Trump, the Republican nominee, with a Herculean task to get to the required majority of 270 Electoral College votes on November 8.
He would have to win a slew of states from Iowa to New Hampshire -- where a WBUR poll Friday put Clinton ahead by seven points among likely voters.
There was more bad news for Trump Friday with a Suffolk poll in Nevada showing her up by six points, a big bump up from her two-point lead there the previous month, prompting the Clinton campaign to announce that vice presidential nominee Tim Kaine would visit on Thursday.
Sensing opportunity in Florida just as registration deadlines approach, Democrats are mustering many of their forces in the Sunshine State.
Speaking in Coral Cables, Clinton tore in to Trump as "unhinged" and unfit for the Oval Office.
Clinton will be quickly followed to Florida by Vice President Joe Biden, who will campaign for her in Orlando and Sarasota on Monday.
And then President Barack Obama, who remains one of the most popular Democrats in the country, will visit Miami on Wednesday to campaign for Clinton.
"Obama will lay out the high stakes of November's election for Florida families and highlight Clinton's vision for an America that is stronger together, with an economy that works for everyone, not just those at the top," Clinton's campaign said.
Obama and Biden won the state in the 2008 and 2012 presidential elections.
A Mason-Dixon poll puts Clinton ahead in Florida by four points, but throughout this polarizing campaign the state has swung back and forth from Republican to Democrat.
In a sign of the opposition Clinton faces, a vociferous and angry band of Trump supporters braved the hot sun Friday to picket her event in Fort Pierce with chants of "lock her up" and "Hillary for prison."
The state is culturally and politically diverse with evangelical churches dotted between well-groomed golf courses and gay nightclubs.
In Florida, it is said, the further north from liberal Miami you go, the closer you come to America's Deep South.
Clinton has sought to appeal to the state's many Hispanic voters by slamming Trump's plan to build a wall along the Mexican border.
In Coral Springs, she also voiced support for former Miss Universe, Venezuelan-born Alicia Machado, whom Trump has taken to insulting about her weight on Twitter.
Clinton's campaign brought Machado into the political spotlight, the latest example of Team Hillary baiting what they see as an impulsive and ill-disciplined opponent.
Clinton also offered a brief eulogy for Cuban-born baseball star Jose Fernandez, who played for the Miami Marlins before he was killed Sunday in a boating accident off Miami Beach.
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)