The president is the one who signs treaties.
THIS IS A DRASTIC TIME.
He has shown strong support for the bill.
Source?
This is one of the most ambitious attempts yet from the U.S. government to fight online piracy. President Barack Obama and Vice President Joe Biden have pledged this year to help protect U.S. intellectual property. In June, Biden made headlines when he said: "Piracy is theft, clean and simple. It's smash and grab."
http://news.cnet.com/8301-31001_3-20016995-261.html
Pledging to help protect property is not the same as showing support toward a mostly irreverent bill.