Mark Cuban isn't a fan of tax inversions, either. Last night, President Obama spoke with CNBC's Steve Liesman, and their first topic of conversation was the issue of tax inversions, or mergers where U.S.-based companies acquire foreign companies and move their tax base overseas to enjoy lower rates. Obama said this strategy, among other things, "undermines people's confidence in how companies are thinking about their responsibilities to the country as a whole." Cuban took his rhetoric a step further: he said he's selling stock in companies that move for tax reasons. On Twitter this morning, Cuban fired off a series...