Liberal Vermont senator Bernie Sanders may be the first Democratic candidate to challenge the expected run of Hillary Clinton. “I am thinking about running,” he said on NBC's Meet The Press on Sunday. He said he will head to Iowa to help determine if he should run as a Democrat or an independent. "One of the reasons I'm going to Iowa is to get a sense of how people feel about it," he said. "The truth is (there is) profound anger at both political parties, more and more people are becoming independent.” Sanders has hinted at a possible run before and could cause some bumps in Clinton's likely road to the 2016 Democratic presidential nomination. "The issue is not Hillary," said Sanders, who added that he has “a lot of respect” for her. Even if Sanders makes a run and doesn't win the nomination, he could potentially force Clinton to go to the left in the primaries or take votes away from her as an independent candidate in the general election.