Over past 7 months, Mitt Romney’s favor among Republicans has fallen off a cliff. Monthly surveys by Public Policy Polling shows that Romney’s level of support has fallen to just 48% among Republican voters from a high of 67% in May of this year. Romney polled in the 60s on the first three polls but has not reached that threshold since and now for the first time he's below 50% with the party base. I don't have any theories to explain Romney's popularity slide with Republican voters but it certainly bodes ominous for his 2012 nomination prospects if he can't...