Bill Minor (who has covered Mississippi politics since the early 50s) has some fascinating history about what the Democrats did about John Bell Williams, a Mississippi congressman who was stripped of seniority and a committee chairmanship, both, for campaigning for Barry Goldwater in 1964. Minor strongly disliked Williams (there was much to detest about him and pretty much nothing to like).
Minor writes:
Back in the 1964 presidential race, Mississippi Rep. John Bell Williams, a hard-line segregationist, supported Republican Sen. Barry Goldwater of Arizona against President Lyndon B. Johnson, who won in a landslide.
The House Democratic Caucus not only stripped Williams of his committee chairmanship, but wiped out his seniority (I wrote back then they left Williams little more than his zip code).
What did Williams do? Rather than switch to the Republican Party, he resigned his seat and returned to Mississippi to run for governor in the 1967 Democratic Primary.
...
One of the most hilarious scenes ever in Mississippi politics came during the first primary beteen segregationist warhorses Williams and former Gov. Ross Barnett over the "tapes." Everyone knew the "tapes" meant recorded conversations between Barnett and U.S. Attorney General Robert F. Kennedy and his brother, President John F. Kennedy, preceding the Ole Miss crisis over the admission of James Meredith.
In a finger-shaking, vilification-tossing clash - poetically, at a White Citizens Council forum - Williams discombobulated Barnett by asking him about "deals and underhanded agreements" he made with the Kennedys over admitting Meredith. Barnett tells Williams: "bring out your tape, if you've got one; bring it out and play it." Mind you, nothing had been said at that point about the Barnett-Kennedy tapes. So this was actually Barnett's first admission they existed.
The Williams governorship became one of the surliest the state has ever experienced, ending with a special session of the Senate called by Williams near the end of his four-year term, to confirm some appointees. The Senate snubbed Williams by quickly adjourning without action. As governor, Williams was more interested in shaking his fist at the National Democratic Party and the federal government than implementing programs to relieve the entrenched poverty in his home state.
Conservative blogger Free Citizen / SouthernCrown provides some interesting additional historical gloss and corrective to the Minor piece (as an aside, I think FC/SC is right about the corrections, although he's more positive about Williams than I'd be) for those who want more of the history.
If you've not heard the tapes of Ross Barnett trying to put one over on both the Kennedys and the people of Mississippi, they are very much worth seeking out. However low your opinion may be of the man, the tapes will send it lower still.