WASHINGTON, Oct. 5 (UPI) -- Former Vice President Al Gore will return to the campaign trail next week to stump for Hillary Clinton, targeting younger liberal voters concerned about his signature issue, climate change.
Polls show Clinton has struggled to win over some millennial voters who overwhelmingly backed her primary opponent, Vermont Sen. Bernie Sanders. A higher percentage of young voters than older ones are weighing a vote for either Libertarian Party nominee Gary Johnson or Green Party nominee Jill Stein.
Gore's presence is also a reminder to Democrats there can be consequences to voting for a minor party candidate. Gore lost the razor-thin 2000 election to George W. Bush, thanks in part to the number of liberals in Florida who voted for Green Party candidate Ralph Nader.
In the years since losing that election, Gore has been working as an advocate for the environment, seeking to raise awareness about the perils of climate change. His 2006 documentary An Inconvenient Truth won an Academy Award.
Gore endorsed Clinton after the primary but did not attend the Democratic National Convention.
CNN reported the Clinton campaign has not said where Gore will campaign, but he is expected to hit the road early next week.