Dude's had multiple strokes; his own staffer notes his change in disposition

https://people.com/john-fetterman-shares-graphic-photo-of-stitches-after-fall-11850101

Prior to his Nov. 13 [stroke], Fetterman experienced a stroke while on the campaign trail in May 2022, and in May of that year shared that he had been diagnosed with atrial fibrillation, which affects the two upper chambers of the heart. Ventricular fibrillation, the condition his spokesperson referred to after Fetterman's most recent hospital stay, affects the two lower chambers.

In February 2023, Fetterman was hospitalized overnight for lightheadedness. At the time, his spokesperson said, "Initial tests did not show evidence of a new stroke, but doctors are running more tests and John is remaining overnight for observation."

Just weeks after he was admitted to the hospital in February, Fetterman checked himself into Walter Reed National Military Medical Center for clinical depression.

“Part of the tragedy here is that this is a man who could be leading Democrats out of the wilderness,” Jentleson said. “But I also think he’s struggling in a way that shouldn’t be hidden from the public.”

I'm guessing you either did the same, or didn't vote.