After 30 years it was so good it could make Republicans who’d been making fun of Trump as a notorious failed businessman, clownish self-parody, conman, and philanderer five minutes earlier (and I mean common voters, not politicians) do a 180 on a dime and send the dude money.
None of this was built for Trump, but in priming their base to never consider voting for a democrat, they made them both way too right-wing and also made them wonder why Republican politicians weren’t going after democrats way harder (they’re so terrible, after all!) which teed up a coup within the party just perfectly.