"People are really aggravated at the government right now," McCaskill said. "There are a lot of people that are just going, 'Really? You guys can't get anything done? All you do is fight.'"
McCaskill, who previously called the Vermont independent senator "too liberal" to win the Democratic nomination, also noted that both men have so far avoided super PAC ties. Trump is mainly financing himself, and Sanders refuses to accept support from a super PAC.
"I think the chord that we are touching all over the country is that people are profoundly disgusted with the economics that make the richest people richer and everybody else poorer," Sanders said.
Trump is -- as he often reminds people -- very, very rich.
McCaskill's comments came on the same day that Sanders topped Clinton in a New Hampshire poll.