You are confusing the Democrats with some of their moonbat supporters.
Political parties exist to win elections and exercise political power. If the voters change their views then the parties will also change.
For example, George Wallace was an outright racist for much of his career. When it became clear to him that racism was a political loser he famously apologized and said "I was wrong". He won his last election to Governor of Alabama with significant black support -- something that would have been unthinkable years before. That's becuase George Wallace was a politician, not a racist. He adopted racist views when it served him politically and dropped them when they didn't.
The Democrats -- what's left of them -- will eventually come around, especially after their "Old Guard" dies off. Meanwhile, notice how politicians like Shrillary and Carter's kid are still holding "pro-choice" positions, but are personally "anti-abortion" (their terms of course). That's because they know that abortion is not as popular as it used to be. That's due, IMHO, to the winning of hearts and minds on this issue, not legal proceedings or elections. Their ridiculous straddle won't work, but I suspect that the Democratic Party will soon not be so pro-abortion as they are now.