The graphic above for the Real Clear Politics polling average for the GOP Governors race shows that Mastriano's lead began on April 15 and the gap began to widen on May 4. His actual percentage of the vote was 44% which was 9.7% higher than his final RCP average of 34.5%. The other candidates performed fairly close to their polling averages which suggests that the undecided voters broke for Mastriano in the last days of the campaign. This is partially explained by Trump's last minute endorsement of Mastriano. Jake Corman and Melissa Hart dropping out of the race to endorse Barletta had no effect.
The Senate race in PA has received a lot more scrutiny than the governors race. McCormick received a bigger surge in the last days of the campaign. Oz's percentage of the vote was 4.4% higher than his polling average while McCormick's was 10.5% higher. Kathy Barnette performed almost exactly the same as her polling average. My cousin Casey Contres is biting his nails over this one with the upcoming recounts. Trump's endorsement of Oz did not carry the same weight in this race.
On a local note, State Rep Frank Burns defeated challenger Michael Cashaw 72% to 28%. There were no exit polls in this primary which makes it harder to determine what the voters were thinking. I also have yet to see head to head polling for the Democratic and the GOP candidates for statewide offices for the fall. One bright spot for progressives in PA is that Summer Lee has won her primary for congress in Pittsburgh despite a smear campaign from outside groups.