Wonkblog: How tough will Tom Perez be on Wall Street? This case could tell.

As his name floats at the top of the list to replace Attorney General Eric Holder, Labor Secretary Thomas Perez is facing a critical test of his stance on Wall Street. The popular Democrat must decide whether Swiss banking giant Credit Suisse can continue to handle the retirement funds of millions of police officers, firefighters and teachers after pleading guilty to helping wealthy Americans evade taxes.