For weeks now, we've been hearing about a planned convention of the "tea party" movement in Nashville next week. The organizers have touted the slate of true-blue (or maybe I should say true-red) tea partiers who would be speaking at the event. Among those heroes (or heroines) of tea partydom were Martha Blackburn (R-TN), Michele Bachmann (R-MN, or is it Mars?), and Sarah Palin (R-Fox News). Well, now, two of the speakers, Blackburn and Bachmann, have pulled out, citing belated concerns about congressional ethics rules. Only the stalwart Palin continues to stand four-square with the tea party convention organizers. The convention has all along presented problems for the truly grassroots section of the TP movement. You see, it is a "for profit" venture. Several groups have looked at the success of the TPers in stirring people up and thought, "How can we co-opt this movement and make a buck off of it?" (It is the American Way, after all - the fre...