Vermont Sen. Bernie Sanders is unfazed that no one in Congress is backing his underdog presidential bid, noting that the Democratic establishment is firmly backing Hillary Clinton.

"I think it's clear to say that Clinton is the candidate for most members of Congress and the Democratic establishment," Sanders said on CNN's "State of the Union" Sunday.

The Vermont independent has served in Congress since 1991, first as a House member and then as a senator. But that experience hasn't gained any help so far on the campaign trail as no member of Congress has endorsed him.

But Sanders downplayed the absence of endorsements by noting that Clinton has extensive ties to Democrats in Congress.

"I think we will get some endorsements," said Sanders. "All over this country ordinary people and elderly people are moving in our direction because they do want a candidate to take on the establishment."

Sanders criticized current campaign finance laws, calling them "essentially corrupt" and saying that the Koch brothers "can put as much money into the system as they want to elect candidates that make the rich richer." He lamented the power of wealthy special interests and promised that if elected his cabinet "would not be dominated by representatives of Wall Street."

"I want a cabinet focused on rebuilding our crumbling infrastructure," Sanders said. "We have to create a whole lot of jobs to put our kids back to work."

Sanders has drawn big crowds in early primary states, most notably drawing more than 5,000 in Council Bluffs, Iowa, earlier this week. He still lags behind the frontrunner Clinton in the polls but has been gaining recently.