He's not responsible for the shenanigans in AZ or AK, or elsewhere where the Rats manipulated the rules and votes.
Trumps endorsement record is actually pretty poor. And it’s documented to be pretty poor.
Picking incumbents is easy. Any dummy can do that since they win the vast majority of the time. But look at the challengers. Especially in the Senate. Pretty pathetic actually.
https://ballotpedia.org/Endorsements_by_Donald_Trump