Sen. John Fetterman and his possible future U.S. Senate colleague Graham Platner are both Democrats, but that’s not keeping them from trading profanity-laced barbs. During a town hall on Sunday, Platner — the frontrunner in Maine’s Democratic primary on Tuesday — was asked about forming relationships in the Senate if he were eventually elected. Platner chose to compare himself to Fetterman, who has frustrated Democrats with his constant criticism of the party, frequently on Fox News, and his support for President Donald Trump’s nominees and policies, such as the Iran war. “As you can all probably tell, I got a...