Gallup says pro-life and pro-choice camps are evenly split (47% pro-choice vs. 46% pro-life). Among registered pro-life voters, 24% say they will vote only for a candidate who is pro-life:

gallup

24 percent of 46 percent is 11 percent, not 4 percent.

Whether Sen. Mitch McConnell will push pro-life legislation remains to be seen.