Nate Silver suggests that the Bain controversy is potentially far more damaging for Romney than Reverend Wright was for Obama:
In the case of Mr. Wright, there were videos of certain sermons, and there were questions about how close Mr. Obama was to him personally and to his church. But the supply of new information was soon exhausted. By contrast, the transactions that a company like Bain Capital engages in are complicated, and it made dozens of investments. Each investment might constitute its own compelling story, some of which might reflect favorably on Mr. Romney, others less so.
The longer that investments made by Bain Capital are deemed to be salient to the presidential campaign, the more effort financial and political reporters will make in pursuing leads about them, hoping to uncover a "scoop." It is true that the public might develop a level of exhaustion with these stories, but they would be a target-rich environment for reporters, and Mr. Romney’s campaign would have to spend resources in making sure it manages the news coverage as well as it can.
The Dish 