I haven't seen any effective attacks demonizing the Democrats over abortion. The ones I have seen have been dismissed out of hand even by other Republicans. The worst was when my University's Pro-Life Vanguard chapter decided to put up huge (think 6 feet x 4 feet) posters filled with pictures of aborted fetuses on the campus green. Created some buzz around campus, and even some ardently pro-life Republicans I knew criticized it as going too far.
On the flip side, I've lost track of the amount of attacks on Republicans where supporting even the slightest limits on abortion makes one a religious nut, hillbilly, obsolete, morally bankrupt, pro-rapist, and a lot of other stupidly mean words.
In terms of attacks over abortion, I'd say the Democrats are treated far more fairly than Republicans.