That was chickenfeed to Cantor.
He didn’t go all out against Brat. RINOs learned from his loss to go all out in the primary (see Miss.).
And that’s all they learned.
Paradoxically they now do more to please their donors and screw their electorate as a result of Cantor’s loss!
At least IMO it seems that’s what they do- to get more money from their donors to fight off primary challenges.
Cantor was doing 2-3 mailings a day and non-stop radio and TV ads. He was going all out, I live here and was working against them.
When you’ve screwed the voters too many times, money doesn’t matter.
In a primary, it is a much smaller pool of voters and it is easier to knock off incumbents than in a general election.