UPDATE: Other Purple Tie sightings
1) He wore a Purple Tie at the IFPC dinner on November 21st, 2010 in West Des Moines, IA. It seems that any high-profile appearance lately, he wears a purple tie. Now this purple-tie-wearing Mike Huckabee wouldn't be that significant, BUT he was in Iowa and all the supporters commented that if he was wearing a purple tie, he would run. He wore a purple tie.