This was a shock, since frontrunner John Fetterman is relatively young (52) and has an aura of invincibility. Via CBS News: PITTSBURGH (KDKA) -- Pennsylvania Lt. Gov. John Fetterman is recovering following a stroke, his campaign announced Sunday. Fetterman, who is running for the Democratic nomination for the state's U.S. Senate seat, did not suffer "any cognitive damage," a release from his campaign said.