They asked way more then one question though.
I mean further breakdowns...
22% Abortion Legal under any circumstnace
15% Legal under most circumstances
37% Legal under some circumstances (presumibly rape, life in danger....)
23% Not Legal.
To compare to last year... every positions is down except Not Legal... which got an 8 point boost.
Furthermore this study is in line with three other surveys.
Two more Gallup polls and a Pew poll.