Did Robert La Follette, Jr. Caucus with R or D?

Caspian

Banned
Robert La Follette, Jr., apparently disbanded the Wisconsin Progressive Party in 1946 to run for reelection to the Senate as a Republican (only to be defeated by Joe McCarthy in the primary). I just want to know whether he caucused with the Republican or Democratic parties before that. My assumption is the Republicans.
 
Well you see, back during the time before the 1960s and 70s, political ideology had less to do with whether you put a D or and R on your candidature and whether or not you came from north or south of the Mason-Dixon line. Therefore, you'll find tonnes of vigorously liberal Republicans from New England, while even further quantities of unabashedly ultra-conservative Democrats from the Deep South. It took Nixon's Southern strategy and the Southern disillusion with Jimmy Carter to really change the paradigm down there to be frank. Political alliances back in those days were very loose and ad hoc.
 

Caspian

Banned
I'm familiar with the differences in political ideology and party between today and 70 years ago, but I specifically need to know whether La Follette was more likely to caucus with the Republicans or Democrats after a hypothetical 1946, where he remains a Progressive and is reelected to the Senate.

As a note, La Follette himself is very much outside of the main sphere of the timeline that I'm writing (he might be mentioned once or twice - American progressives and social democrats might be pleased in general, but it won't have very much to do with La Follette), but his caucusing decision has the potential to prove very important.
 
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