Hollywood star Brad Pitt made the rounds in Washington on Thursday keeping a low profile while calling on some some high-profile people to promote sustainable housing.******Pitt dropped by the White House for a private meeting with President Barack Obama but the White House said there was “no read-out” on the visit.******Pitt also went to Capitol Hill to meet with House Speaker Nancy Pelosi and Majority Whip James Clyburn. He joined them for that time-honored Washington tradition: a media availability behind a bank of microphones.******Pitt thanked Pelosi for taking time to talk to him about the post-hurricane rebuilding effort going on in New Orleans, where his “Make it Right” foundation is constructing sustainable houses for low-income residents in the city’s Lower 9th Ward.***    ***Pelosi hailed Pitt as a role model. Clyburn thanked Brad for his help …  and for giving him bragging rights.******”I did not realize when the speaker asked me to chair the Katrina- Rita Task Force that it would lead to my getting in a position to make my grandchildren so envious of me because this effort brought the two of us, Brad Pitt and myself, together,” the South Carolina Democrat said.  ***   ***For the record, Pitt was flying solo on the Hill.  Angelina Jolie was making her own low-key appearance in town shooting a scene for a movie in a blond wig.