There are plenty of good reasons for making Barack Obama a one-term president, among them his adding of $5 trillion to the national deficit and presiding over the slowest recovery since World War II. But reason goes out the window along with common sense for dozens of Twitter followers who have posted threats to riot if Romney wins. Twitchy offers up an assortment of tweets that center on this theme. The majority of them are in black “eye dialect. Here is a sampling: I Heard Mitt Romney , Tryna Take Away Food Stamps , If He Do ."IMA START A...