This piece is not entirely accurate.  Apparently Perez' position was based on erroneous articles written in the Wall Street Journal and the Washington Post, stating that Heath Mello had co-sponsored a law bill requiring women to look at an ultra sound before having an abortion.  That's quite a bit different from requiring doctors to inform women of their right to see an ultrasound.   https://www.thenation.com/article/why-was-heath-mello-thrown-under-the-bus/  I know that for many of you, The  Nation is not a good source of news, but it is a good source for insider info on Democratic Party goings-on.  This piece suggests that there is much more to all of this than just "abortion politics".
This piece is furthering that which it purports to decry -- polarization regarding the issue of abortion.