They did not flip 3 house votes. They flipped the house, the three votes turned out as expected. They had already elected Democrats, but one died and two were elected to other offices. This is all in the link, but the title is misleading.
Finally! Next, the senate, and perhaps then this state can start to thrive instead of barely recover from this recent republican anti- democracy binge.
12INCHVOICES t1_j7o8m7e wrote
So happy. Thank you, Allegheny County voters! And PA voters in general!