In one of the president’s latest campaign commercials — an ominous spot that looks a bit like the trailer to a B-grade horror movie — Mitt Romney gets some flak for his offshore bank accounts. Apparently, keeping money in places like the Bahamas and the Cayman Islands is a sign that one might not be the most upstanding citizen.

This raises a question: Why do some of the president’s wealthiest donors use the same strategies this commercial decries?