Sen. John Fetterman (D-Pa.) ravaged the radical socialist candidates who are taking over his party – but insisted to The Post this week he has no plans to defect, at least for now. “I said months ago, I said the Democratic Party is becoming an orgy of socialism. These recent elections vindicate my description,” he told The Post after Democratic Socialists of America triumphed in three New York House primary races Tuesday that rocked the party establishment. Fetterman, elected in a marquee race