Both Reagan and Trump were once Democrats (Trump from 2001 to 2009).
First, saying that about Reagan is ridiculous, he voted for FDR and then Truman in 1948 when Texas was solidly Democrat and was campaigning for the Republican after that, he gave a major speech at the Goldwater convention and was elected to his second term as a Republican Governor and ran for the GOP presidential nomination all before McGovern’s run for President, much less the Clintons and Obama, and Biden, hardly a good example for modern discussions of ex-Democrats of the modern post-1960s Democrat party.
This Democrat only just registered as an Independent because he can’t get the Democrat nomination, he is still a Democrat and a liberal.