We all know Coakley sucks. She crusaded against the Massachusetts decrim initiative in 2008, and after it passed with 65% of the vote urged municipal governments to circumvent it with local ordinances. She then refused to pursue charges against the District Attorneys who illegally used government resources to campaign against the initiative.
So why do I want you to vote for her?
Simple. Brown in the Senate will be just as bad on the issue, but by sending Coakley to Washinhgton we get her out of the Attorney General's office, while Brown remaining in the State Senate will have little impact.