this is just trash, blatantly misrepresenting the facts to make a terrible point. pre-1964, the democratic party did actually have both conservative and liberal members. this was when the republicans were actually the more progressive party (supported civil rights and more government), and the democrats were composed of two factions, one who were democrats only because lincoln was a republican (racist white southerners) and the other who were interested in helping the lower class (FDR-era progressive democrats, fairly similar to the republicans of the day in terms of goals). black dems were part of this second faction, and it was obvious that a split needed to happen. in 1964 the democrat LBJ passed the civil rights act, which made the southern cac dems (dixiecrats) angry. since they were a huge chunk of the population, they defected to the republican party, took control of it and ran a candidate for president who opposed the civil rights act... this led the progressive republicans coming over to the democratic party and basically created the current political landscape.
so yeah, the democratic party once housed conservatives (racist cacs) and liberals (progressives and minorities)... sounds like shytlock would like to go back to that era.