http://twitter.com/#!/Mruff221/status/369885227880964096 Pretty “powerful” if Mark Ruffalo does say so himself. And he does. The Guardian article tweeted by the “Avengers” actor swoons over a letter Ruffalo wrote about his mother’s “sleazy” illegal abortion. Get this: We’re to believe that a Hollywood actor was “taking a genuine risk” by publicly professing his support for abortion. Really.…