Sen. Barbara Boxer, D-Calif., left, gestures toward Sen. Joseph Lieberman, I-Conn., right, as he shakes hands with Sen. John Kerry, D-Mass. upon his arrival for a news conference on Capitol Hill in Washington today on the environment and global warming. (AP Photo/Susan Walsh) Today over at the Huffington Post, California Senator Barbara Boxer contributes her third post to the locally based blog and news site -- this time in an effort of advocacy: Today,......