The problem with that idea is why would Reagan giving a powerful speech in favor of LBJ bring him much attention in 1964? LBJ was so completely favored both in the primaries and the general election that no speech in favor of him, no matter how good, would bring attention to the orator. You'd either need to have Reagan do something meaningful in 1960 or 1968 if you want to have him remain a Democrat and rise to political prominence. Perhaps something like his "A Time for Choosing" speech but done in support of JFK in the 1960 Democratic primaries? Then perhaps Reagan defeats Kuchel in the 1962 Senate race? (Uness you think he'd try an intraparty contest against Brown in the gubernatorial contest?) Alternatively, Brown appoints Reagan instead of Sallinger to the Senate in 1964 after Engle dies, setting up an contest between two former SAG presidents in the full term 1964 election when he faces George Murphy. Assuming Reagan beats Murphy, a likely butterfly is that The Candidate is never made as that movie was reportedly inspired by Tummey's defeat of Murphy in 1970.
A senatorial career for Reagan sets up the possibility of a Carter/Reagan (or Reagan/Carter) ticket in 1976.
Yeah, the more I muse on this, if you want an interesting Democratic Reagan timeline, having him come to political prominence four years earlier than in OTL with a pro-Kennedy speech in 1960 is probably the way to go.
Hmm yeah, interesting points. A point of divergence in 1960 might make more sense and be more interesting. Let’s say his campaigning for JFK actually is credited with delivering CA to him. Then he wins the governorship over Nixon in 1962 instead of Pat Brown. Then we could have an interesting situation where Reagan might even run as a Democrat as early as 1968, and end up facing Nixon again for the presidency.