"Please take it from me, every single vote counts," Gore added with a chuckle, invoking the messy end to the 2000 election which saw Democrats lose in Florida by just over 500 votes.
Gore used his time at the Clinton rally to jointly argue that Donald Trump is not the right choice for Americans who are worried about the environment of the Earth.
"We cannot risk putting a climate denier in the White House," Clinton said to cheers.
"Donald Trump is quote,'not a big believer in climate change,' Clinton said. "He says it's a hoax."
"Hillary Clinton will make solving the climate crisis a top national priority," Gore said, as he argued Trump would be a "climate catastrophe" if he's elected to the White House.
Meanwhile, for a second straight day Clinton was interrupted during a rally by a protester who was yelling about her husband, the former President, one sporting a "Bill Clinton is a rapist" sign.
Clinton campaigns on Wednesday in Colorado and Nevada.
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