Kind of obvious.  From a New York Times blog: 

Politicians like nothing more than a convenient foil, and Democrats locked in a stubborn impasse with Republicans over new rules to govern Wall Street believe they have found a gold-plated one in Goldman Sachs, Carl Hulse reports in The New York Times.

Democrats say the convergence of their push for an overhaul of financial regulation and a prominent federal securities case against the prestigious investment firm is a matter of coincidence, not planning.

But they have seized on emerging details about Goldman’s wheeling and dealing — recounted in a marathon bipartisan questioning of top executives from the firm on Tuesday during a televised Senate hearing — to put pressure on Republicans.