Bernie Sanders: Meet the Liberals in Congress Who Are Ready for Him Progressive congressmen call Sanders a "credible challenger" to Clinton in 2016.

 -- Early election predictions were quick to forecast Hillary Clinton as the eventual presidential nominee for the Democratic Party in 2016. Along with her breadth of experience in politics and political life, and the powerful support of the “Clinton machine,” it seemed Clinton enjoyed one other key to victory: an empty battlefield in the primary.

But two liberals in Congress disagree. They say the longtime Independent, who caucuses with the Democrats in Congress, may have what it takes to nab their party’s presidential nomination from Clinton in 2016: Sen. Bernie Sanders.

Enter Rep. Keith Ellison, D-Minn., and Rep. Raul Grijalva, D-Ariz., the co-chairs of the Congressional Progressive Caucus. While neither endorsed Sanders’ likely presidential run, which he is expected to announce on Thursday, the two congressmen certainly endorsed the idea of their Capitol Hill colleague running.

“We're proud that Bernie is going to make this a real race. He's going to bring up some important points, and we believe that it's a good idea to have a spirited discussion on these issues,” Ellison said. “We think this is good news, and we welcome it.”

“I think it's part of a very important dialogue,” said Grijalva of the issues he believes Sanders will campaign on, should he decide to run.

But could the Koch brother-bashing, Wall Street-hating, environmental protest-loving, ultra-liberal senator from Vermont pose a credible challenge to Clinton in the primary?

“Absolutely,” said Ellison. “The issues that Bernie is raising are things that people all over this country want to talk about: trade, wages, also issues of climate change. He's raising important issues, and I believe it's good for the voters to have a selection.”

Added Grijalva, “I think those are issues our base wants to hear about very desperately and I think he's going to bring that to this whole primary.”

As for whether Sanders could actually win the Democratic nomination, Grijalva pointed to common perceptions of the senator that wrongly undermine his credibility as an obstacle for Sanders’ campaign.

“Bernie has unfortunately been many times dismissed as a gadfly, Grijalva said. "The fact that he continues to be elected, [that he] got elected to the Senate, means his ideas have credibility."

But still, Grijalva believes the challenge is surmountable.

“Once we get past the stereotype and listen to what he's talking about, there's a great deal of credibility there,” Grijalva said.