>> Hillary Clinton, hitting the campaign trail Tuesday, and joining her for the first time, former vice president Al Gore.>> Every vote counts. That's why I am here, and that's why I will vote for Hillary Clinton.>> And not just anywhere, but in the ultimate battleground, Florida, the epicenter of Gore's spectacular loss in 2000, when a too close to call vote ended in the Supreme Court handing the state and the election to George W Bush.
>> Take it from me, it was a very close election.>> Clinton and Gore's message to Democrats now, don't let it happen again. Reuters campaign correspondent James Oliphant.>> Gore can use his own experience as sort of a warning to people who haven't registered yet, that every vote counts.
Particularly in Florida, Florida's a critical state. We've seen where if it goes to the Republicans, you can lose an entire presidential election that way. What Clinton needs to guard against right now is any sense of complacency because polls are showing Clinton with a rather substantial lead, perhaps as high as 9 or 10% over Trump.
And she has to make sure that her voters stay engaged and motivated and not just assume that Clinton has this thing wrapped up.>> Clinton has another goal for the joint appearance in Florida.>> The climate challenge has only grown more stark. And I will tell you this, it is one of the most important issues at stake in this election.
>> By focusing on the environment, a topic that's won Gore a Nobel Peace Prize and an Oscar.>> Hillary Clinton will make solving the climate crisis a top national priority.>> She's also looking to expand her voter base.>> Clinton has struggled attracting support from millennial voters. And the feeling is that by highlighting the climate change issue, which a lot of young voters care about, it might be a way to reach that community.
Climate change is a very sensitive issue in Florida because of the issue of rising sea levels. Particularly in Miami, there are projections that parts of Miami could be underwater within a matter of decades, and so it's an issue that hits very close to home there.>> The state feeling its vulnerability to the sea in just the last week.
Hurricane Matthew, the strongest storm to hit the region in a decade, left homes and businesses destroyed from flooding and forced millions to evacuate. It also forced the state to extend its voter registration deadline until next Tuesday.