Warren sits on the Senate Banking Committee, which has marked up all of two bills so far this year (she played a role in both, passing an amendment to a national insurance licensing bill and working closely with the committee leadership on reforming the Federal Housing Administration). But she has really shone in oversight hearings, where she has gained a reputation for offering uncomfortable questions to regulatory officials about their lack of prosecuting criminal activity on Wall Street. “Too big to fail has become too big for trial,” she said at a hearing in February. “How big do the biggest banks have to get before we consider breaking them up?” she asked Treasury Secretary Jack Lew in May. And she’s used the bully pulpit outside the hearing room, too, schooling CNBC anchors so badly on the history of financial regulation that the network forced the clip to be removed from YouTube.
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This extends beyond the occasional badgering of witnesses (“I beg your pardon,” said Warren when I termed it that way, though she misunderstood, as I have a great affection for badgering). In one of her first major actions, Warren opened an investigation into the Independent Foreclosure Review, which was supposed to review every foreclosure from 2009-2010 for errors, but ended up so botched (the banks picked their own reviewers) that regulators shut it down and gave wronged homeowners a seemingly random amount of cash compensation, typically around $300. Warren demanded information on how the aborted reviews were conducted, what they found and how regulators arrived at the final penalties. After a series of embarrassing hearings on the subject, last month Federal Reserve chairman Ben Bernanke promised the release of some details, though none have yet come out.

Other agencies have come to expect Warren’s queries. Just yesterday, she asked the Justice Department about why it settled with five large banks who submitted fraudulent mortgage insurance claims to the FHA for $225 million, when based on the number of claims made public in a government report, the damages could have been as high as $37 billion. That comes out to a settlement for 0.6 percent of potential damages.