I have researched private equity and found it to be a complete taxpayer scam.
What I have found is they get a lot of debt to buy the company and when they do they put it on the books of the company they buy. Usually they manipulate the price of the stock down prior to buying it. Being on the books it is tax deductible before the 35% corporate income tax. Thus, the portfolio company, the management company, will always keep the companies fully loaded with debt. Debt they control. Then as they issue more debt, they also issue large dividends off the company, generally money of the debt.
In summery if you vote for Romney, you are voting for a moral crook. The loophole is easily eliminated by taxing corporate debt after corporate income tax.
If you own a stock that is ever bought out, make sure you sue them. They have no right to go into your account and take your shares.