46% may reasonably be described as close to half, but the details on the support for legal abortion in the poll (both on the page you linked and the additional information from the poll linked from that page) is inconsistent with the idea that "pro-life" identity equates to not supporting legal abortion, as the proportion of the population opposed to legal abortion is much less than half the proportion identifying as "pro-life".
I only said "do not support abortion", I did not say against abortion. Actually even on the "pro choice" side, there is only half believe abortion should be legal under any circumstance.