Does Mitt Romney Have Something to Hide?

Mitt Romney's presidential campaign is based on lifelong success as a businessman, but he'll only release the last two years of his tax returns. It's not clear if he's been candid about when he left Bain Capital, the company he founded and that made him a fortune. He says he left the firm in 1999 to go run the Summer Olympics in Utah, so he was not responsible for Bain Capital companies that went bankrupt or laid off workers after that. But the Boston Globe says documents filed with the Securities and Exchange Commission show otherwise. Even Republicans are telling Romney to come clean and suffer consequences they say will be only temporary, while Democrats are having a field day. Why won't Romney be more transparent?  Is it all about finance, political strategy or character?