Alex Massie spots another weakness:
No matter how much private wealth can impress some voters it's also easy to see how you can write an attack ad pointing out that Romney became a vastly wealthy man by purchasing ailing companies, firing half the workforce and stripping any assets that could be used to turn a profit.
This isn't entirely fair. Some of those companies might have failed anyway and others were doubtless saved by private equity. If that meant a smaller workforce so other jobs could be saved and the business resurrected then so be it. A price worth paying and so on but a tougher thing to sell during an election campaign.