President Obama's choice to replace Timothy Geithner as Treasury Secretary is a lawyer and budget expert. He's also a former Citigroup banker who served as a longtime White House loyalist and is now making the Capitol Hill rounds to bolster his nomination. Yet for all that's known about Jack Lew's past, his views on banking policy remain something of a mystery. One key question is whether as Treasury Secretary he'd support the Financial Stability Oversight Council as vigorously as has his predecessor. In addition to FSOC, at issue are Lew's views on implementing the Dodd-Frank Act, the "Too Big to Fail" doctrine and the designation of non-banks as posing systemic financial risks.