The arrest of a fourth Palm Beach County commissioner last month should raise the stakes on corruption investigations in Florida.

Ousted Republican Party Chairman Jim Greer calls them "the four horsemen." But Bill McCollum, Mike Haridopolos, Dean Cannon and John Thrasher do not appear on the prosecution's witness list.

While Gov. Charlie Crist is named 62 times in the investigative report on Greer and could be called as a witness by both the prosecution and the defense, the four top Republicans are nowhere to be found.