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​Should Al Gore consider running against Hillary Clinton?

As media attention focuses on Hillary Clinton's email accounts and the foreign fundraising practices of the Clinton Foundation, some liberals have begun casting about for an alternative candidate.

Vox's Ezra Klein has settled on Al Gore, who, he wrote, will tackle the "existential threat" of climate change, while GOP Senator Jim Inhofe, R-Oklahoma, "is throwing snowballs on the floor of the Capitol because he believes cold weather outside his office proves global warming a hoax."

Klein also points to Gore's ability to self-fund a campaign, a key consideration in taking on Clinton, who is expected to have a deep reservoir of funds for her presidential run. Since he left the political world, Gore has become a rich man, making millions from his shares in Apple, his sale of Current TV to Al Jazeera, and several other ventures.

There are some challenges, however. "The problem with a Gore candidacy, to be blunt, is Gore," Klein wrote. "His relationship with the press is challenging, to say the least. He is an aging politician in a country that loves new faces."