Will Fletcher critics take up challenge and "put up or shut up"?

Last week, the Gov. put out word to his critics to "put up or shut up". The question becomes: will they? And if they do, who will it be and which way will they go? My guess is that many in the Gov.'s party are going to wait for an answer before making a decision. Others (both inside and outside his party, including the press) have suggested his friends tell him to go or have made up their minds not to vote for him, already believing the Gov. has something to hide unless he faces a jury of his peers.