Left Wing does not play well here.
You sure about that? The lieutenant governor is a Bernie Bro singularly focused on legalizing pot, George Soros bought the Philadelphia DA spot, Democrats won seats throughout the state in part because of redistricting but moreso because the left wing was ready to play in the state.
Left wing values may not play well to a majority of Pennsylvania residents, but at least they play. The republican party is terrible at turning a demographic and ideological advantage (if there is one) into victories at the polls.
Pennsylvania should have two republican senators, but the party didn't care to support Lou Barletta. Bob Casey was originally elected in a ghost campaign that relied on elderly voters thinking they were voting for his dad... and Rick Santorum couldn't win or even point that out. The state should have a republican governor, but Corbett barely tried to run a campaign and the party didn't want to support Scott Wagner. The republican party didn't fight redistricting, doesn't bother competing in Philly, only seems to support chamber of commerce candidates, doesn't fight against the rampant corruption in the state legislature, on and on. It's only due to the enthusiasm of individual voters and local community groups that any republicans are elected in the state at all. Sorry for the rant.