Ron Davies has a point, but companies mentioned are portfolio companies of Bain Capital. Looking only at HCA-
(Portfolio companies are those companies that are currently or have been previously owned or controlled by the private equity investment firm, Bain Capital, or its affiliate funds. "Ownership should be material (i. e., full control, majority ownership or significant minority ownership." Wiki.)).
HCA is one of those companies.
It was obtained by Bain Capital, Kohlberg Kravits Roberts and Merrill Lynch for $31.6 billion. What the shares of ownership among this group are, I don't know.
In any case, Bain Capital has a large share. Original founders were Romney, Andrews and Kriss. Of Bain's $65 billion portfolio, HCA's portion is bound to be quite large.

The 2012 election campaign looks to be quite different from the one in 2008, when Romney failed. I am not saying that Romney will be the choice in 2012.
I look for a new light to appear, perhaps the new senator from Massachusetts. In spite of her appeal to middle America, I don't see Palin as the choice.