John Nichols, The Nation, August 26, 2011 Elizabeth Warren's all-but-announced candidacy for the Massachusetts US Senate seat once held by Edward Kennedy is a state-based campaign. But it has national implications. It's not just that a Warren candidacy could provide Democrats with a needed pick-up of a currently Republican-held seat - although that's a big deal for the party, which faces a dismal electoral map in 2012. If the Harvard Law School professor who became the chief advocate for real banking reform and the development of a federal Consumer Financial Protection Bureau runs and defeats US Senator Scott Brown, R-Massachusetts ... Elizabeth