Well, I doubt that Shapiro's ad boosted Mastriano. If it did, Shapiro needs to be a campaign manager for republicans. He spent less than a million dollars and Mastriano won the primary by 20+%. if it was only a couple of points, maybe but to swing 300k voters(more than the next primary hopeful got) to Mastriano is a bit of a pipe dream.

The ad was also not saying "Mastriano is a great guy", it was "Mastriano is a cool with hateful mobs" and the like. It was to turn off moderate republicans that had enough of Trump and violence. It was aimed at like the 60% of the republicans that didn't vote for Mastriano in the primary.