I'm guessing he wasn't real pleased at reading with his morning coffee that Hillary Clinton sees no real competition in the Democratic primary:

Sen. Bernie Sanders (I-Vt.), a potential candidate for president, on Thursday expressed little faith that Hillary Clinton would be an acceptable standard-bearer in the 2016 presidential election.

"Based on her history, do I think she is going to be as bold as needs to be in addressing the major crises that we face? Probably not. I may be surprised," Sanders said in an interview with The Washington Post.

Sanders, a self-described "socialist," is considering running for president as either Democrat or an independent. Asked repeatedly about Clinton's record, he mostly declined to weigh in on specifics.

"I have no assessment," he said.

But it was clear that Sanders is not convinced Clinton, the presumed Democratic frontrunner for president, has made a forceful enough argument about how to combat income inequality, a central focus of the Vermont senator.

"Not much," responded Sanders when asked about what he has heard from Clinton on income inequality and related issues.

Pro-Clinton group Correct the Record pushed back on the former secretary of state's economic record. “Hillary Clinton has fought all her life to ensure that all Americans have the opportunity to succeed – championing equal pay for equal work, advocating for middle-class tax cuts, and pushing for a raise in the minimum wage," said spokesperson Adrienne Watson.