Breaking News Emails

Get breaking news alerts and special reports. The news and stories that matter, delivered weekday mornings.

DETROIT- Vice President Joe Biden appealed to liberal activists Thursday, emphasizing his work opposing conservative Supreme Court nominees, pushing for women's rights and fighting income inequality ahead of a potential run for president in 2016 should Hillary Clinton opt out.

Addressing more than 1,000 people at the annual conference for Netroots Nation, Biden broke little new ground, but repeatedly referred to himself as a "progressive" and praised the people in the room for pushing the Democratic Party to the left on issues like gay marriage.

He called climate change "the single greatest challenge to humanity today." Biden's decision to appear here suggests he is considering a 2016 run. This conference is full of liberals who are active in their local communities and could be important supporters of a presidential campaign. Several Democrats, including Barack Obama and Clinton, came to this event during the 2008 race.

Massachusetts Sen. Elizabeth Warren, who some liberals here are urging to run for president, will speak at Netroots Nation on Friday.


-- Perry Bacon