Back then, most people didn’t consider it an urgent issue because most people considered it settled law and didn’t really believe it would be overturned. Most people didn’t really consider that the Supreme Court would be compromised to the degree it has.
That perception has changed dramatically, and it’s proven to be a winning issue for Dems. As the next voting cycle ramps up, it will likely be a big campaign point. In order to have any chance at all, though, Dems must gain a solid majority in Congress.
When exactly was there a pro-choice majority in Congress? It wasn't all that long ago that abortion wasn't as polarizing in its partisanship, and so there were quite a lot of anti-abortion Democrats from the south, just as there were a handful of pro-choice Republicans.
If you're referring to the time when Obamacare was passed, several of those Democrat Senators were anti-abortion.