"The're were a few Southern Rpublicans supporting the filibuster in '64"................You're right. The most prominent Pubbie actually filibustering (and maybe the only one) was our great Senator John Tower of Texas. He was elected in a special election to replace LBJ whe he moved up to VP.
Senator Tower was a real conservative and a loyal Southerner and was the first Republican elected to the Senate from Texas since "Reconstruction". His Dad was a Mehodist Minister. He also graduated from the same High school as I did (Beaumont High School, Beaumont, Texas).
Wasn't Tower the 4 foot tall weasel that was caught running around with prostitutes? Oh my!
I'm an Angleton grad. Not too far from BHS.