Given Fred Thompson's rocket ride in the polls recently, it's no surprise his trend line in the Intrade futures markets over the last 50 days looks like this:

What is quite surprising, on the other hand, is Rudy Giuliani's trend in the Intrade markets. Despite his continued slide in the most recent round of polls released in the last two weeks (Cook/RT Strategies down 6 vs. last poll, Gallup down 4, NBC/WSJ down 4, LAT/Bloomberg down 2), Giuliani has made a pretty significant rebound in the futures markets during the same period:

What triggered the reversal? Hard to say - but Giuliani did announce on June 6th he'll be skipping the Iowa straw poll.