PA House of Representatives State Rep. Ed Gainey launched a bid to challenge Pittsburgh Mayor Bill Peduto’s re-election Tuesday night, issuing an emailed statement that said he was running “because I know that the working people of Pittsburgh need opportunities for good union jobs with a living wage and benefits, affordable housing, genuine public safety, and a city where we can all belong and contribute.” The statement said Gainey, 50, plans an official kick-off event to be held Saturday afternoon, which will almost certainly mark the beginning of Peduto’s most serious challenge. ...