Speculation had begun this week that Hillary Clinton's campaign might start going negative on Barack Obama. She didn't have much to lose after the debacle of the Potomac Primaries, and she desperately needs to slow down his momentum. Apparently, the speculation was correct, as Hillary has begun slamming Obama's economic proposals on the stump in Ohio: Democrat Hillary Rodham Clinton, criticized for taking corporate special interest contributions, proposed restrictions on a wide array of industries Thursday and stepped up her assault on rival Barack Obama, casting him as the candidate more beholden to corporations. In a speech to General Motors...