Any time a story can be sifted down to "Democrats in disarray" - the clear winner is the Pittsburgh Post-Gazette.
See the thing is, the PPG is owned and operated by the ultra-wealthy MAGAs of the Block Family. They have no interest in helping Democrats, and they hate the fact that Democrats are the only viable candidates in the Pittsburgh mayoral race. Yes there was a last minute big money shift, but the shift was in donations to Mayor Ed Gainey who was losing badly to challenger Corey O'Connor in the May primary.
Ed Gainey LOST the primary, and it makes him something of a lame duck, but he can still run as an independent candidate in the Fall, if he so wishes. I don't give him much chance of winning a 2nd term though, especially since he won't have the endorsement of the Democratic Party.
There really is no "Dems in disarray" story here, as much as the Post-Gazette would love to stir one up. Corey O'Connor has always been the sentimental favorite of Pittsburgh Democrats. Combine that with the lukewarm record of Ed Gainey's 4 years, and outcome of the May primary isn't puzzling at all.