This is not going to be a popular thing to say here, but abortion is considered by 79% of the country to be legal. If Trump appoints a judge who overturns that decision the GOP will lose, the Democrats will win decisively, and the limits currently on abortion will be lost, quickly.
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Your link says pro-life and “pro-choice” (should be pro-abortion) are evenly split. And only 29% think abortion should be legal in all circumstances.
There are a lot of people who identify as pro-life who believe that abortion should be limited. There are only 18% who believe it should always be illegal.
It is only popular because we haven't been told what it is. We weren't really outraged about Hitler's prison camps until these showed up.