Elizabeth Warren, architect of the Consumer Financial Protection Bureau, launched her campaign against Sen. Scott Brown (R-Mass.) Wednesday. The Harvard Law professor, who advised President Obama and Treasury Secretary Timothy Geithner as the CFPB took shape, has been the subject of senate rumors for the past six months. In a campaign video published at elizabethwarren.com, she states: “I’m going to do this. I am going to run for the United States Senate. Middle-class families have been chipped at, hacked at, squeezed and hammered for a generation now, and I don’t think Washington gets it.” Warren began Wednesday greeting commuters in Boston. She guided the CFPB in its infancy, leading up to its July launch. Warren has been in the headlines all year as the administration launched the CFPB. She got into some contentious discussions during congressional hearings in which she was probed about the new agency’s role in advising attorneys general on a massive mortgage servicing settlement and on the make up of the CFPB. Write to Kerri Panchuk.