I’m a registered Republican. I am so that I can vote in Pub primaries here in Ga. I vote against every Trump endorsed/MAGA candidate on the ballot. In the General election I blindly vote straight Dem.
The tactic has been a mixed bag for Dems at least. Famously did not work out for the Clinton campaign when they boosted Trump in the 2016 primary, but there has been success in promoting crazy R senate candidates