DAVID MARCUS: Can John Fetterman save the Democratic Party from itself?

Pennsylvania Sen. John Fetterman is the most anomalous politician in America today. Often willing to buck his fellow Democrats, he appears to be a one of a kind on Capitol Hill, even though his ideas are shared by the majority of Americans, including a lot of Democrats.

It is not entirely clear how Fetterman went from being a progressive, and failed, candidate for Senate in 2016 to winning in 2022 and becoming the moderate thorn in the side of the ever-left lurching Democrats. Some believe his medical issues changed him...