The mayor and Mrs. Newsom are pregnant! Rumors began circulating around the Internet and City Hall this afternoon after a gossip blog said friends of Jennifer Siebel Newsom, 34, had revealed she was pregnant. After an emergency powwow, Gavin Newsom's handlers confirmed the happy news."The mayor and the first lady are thrilled to be embarking on this adventure together and they appreciate your good wishes," a statement read.No word yet on when the baby's due.Naturally, the City Hall chitchat has turned to how this might play in Newsom's run for governor. Analysts say that starting a family can only help...