Segregation has never actually been supported by the majority of the US population. It was just supported by a majority of the people that were allowed to vote. Or perhaps not even that.
More to the point, I didn't take issue with having unpopular political positions. That's the great question of representative government...are elected people supposed to do what they want, are they supposed to average what the people who voted for them want, or possibly are they supposed to average what everyone who they represent (Even people who voted against them) want? I have no objection to politicians falling anywhere on that line.
What I took issue with was the Republicans (and it's pretty much entirely the Republicans, with some conservative Democrats) having unpopular political positions so they then _lie about things_ to make those positions more popular. I.e., stuff like 'Death panels'. And the current nonsense about how the deficit is a huge problem, which even Democrats have bought into. (Fact: The deficit is actually dropping very rapidly, and without any changes at all, we'd probably have a balanced budget as soon as the recession goes away, especially since we're ending our wars and ending some tax cuts.)
It's one thing to stand up and say, despite the political climate, 'We should not have segregation because it is wrong'. It's another to stand up and say 'We should not have segregation because the Soviet Union can exploit the separation between the races to spread deadly genetically-engineered diseases.' or other crazy nonsense.
And, yes, I complain when Democrats do it also. I.e., during the debt ceiling crisis, when the Democrats kept talking about defaulting on our loans. I kept pointing out that, in actual fact, that's probably what we'd do _last_. We'd keep paying those, it's just the _rest_ of the stuff that would stop. (This wouldn't actually make the disaster any better, and in fact pointing out we'd end up repaying bonds held by the Chinese while letting our elderly starve to death actually sounds a good deal worse than 'defaulting on our loans'. So I don't know why Democrats kept saying it wrongly.)
The thing is, though, the Democrat's positions are vastly more popular, in almost every sense, than the Republican's. If voters are just asked their positions, or presented with positions without the context of what the parties are, they support Democratic policies something like 75% of the time. So even if both parties are equally willing to lie (I really don't know, and won't argue it.), the Republicans end up doing it more.
And often the lies are patently, almost surreally, stupid. Because the right has an echo chamber where lies get amplified, and then the lies escape, and everyone is like 'WTF?' and other Republicans are like 'It's true!' and they all look even stupider. (Like the whole 'rape rarely results in pregnancy' nonsense that keeps popping up, which is grounded in literally _nothing_. Nothing. No basis at all for the statement.)