Sen. John Fetterman has opened up about his “lonely” experience being a rare moderate Democrat in Congress willing to publicly break ranks from his party during partisan fights. The Pennsylvania pol contended that Democrats have deviated from their values on issues such as government shutdowns, as well as border security, leading him to take his own path. “I’ve, you know, had to vote against the caucus,” the sweats-loving senator told “Real Time With Bill Maher” on Friday. “I don’t enjoy that, but we used to be a party that would always refuse to shut the government down. Sweats-loving Pennsylvania Sen. John Fetterman says it’s lonely being a renegade Dem. Getty Images “And now we have shut it down and dropped a lot of mass chaos, and I just couldn’t be a part of that.” Last week, Fetterman penned a defiant Washington Post op-ed declaring that he won’t ditch the Dems to become a Republican, insisting he’d make a “terrible” GOPer.…