Just read the section on his mayorship of Braddock. This bud has been problematic for a long time. I don't think he's gone crazy lately, instead people got sold a counterfeit product during his federal election that they didn't look much into.
He ran on the platform the Democratic Party ran on for 2020, which still held appeal regardless of his track record. But honestly after his stroke his spouse really helped carry him across the general. In the end though she isn't the senator.
But now there's no platform at all so he's just doing whatever he wants, including being a total shitbag. He's a senator for a failed party, after all.