Yeah, but Pence backed Kemp!
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There is a lot more going on there than just Trump vs Pence. Pence could not push any candidate into a winner where they wee not in that position already. Kemp would have been difficult to beat by any candidate, and arriving late to the party is a real disadvantage.
The MSM though, which I brought up, is pushing a Pence vs Trump narrative concerning Kemp making it all out to be some glorious victory for Kemp, and thus by extension Pence, when nothing could be farther from the truth.
Trump mostly tries to endorse whoever he thinks will win - he wants to build a reputation as being “kingmaker”.
Every once in a while he makes an exception - as with Perdue - and endorses someone who’s campaign is in trouble to try and boost their approval.
Mostly though, the smart strategy is to pick winners - and be seen as kingmaker.