By Michael A. Memoli

December 8, 2011, 4:35 p.m.

Is it too late to fire the moderator?

Two more Republican candidates — Michele Bachmann and Rick Perry — said thanks but no thanks to an invitation to participate in an Iowa debate managed by real estate mogul Donald Trump.

The Dec. 27 affair has now just two committed participants, one at the top of the GOP field and one distant aspirant, Newt Gingrich and Rick Santorum, respectively.

Perry’s campaign said he plans to focus his efforts on traditional retail campaigning in the closing weeks. His campaign announced plans for a 44-town bus tour starting next week.

Bachmann, who earlier this week had expressed reservations about Trump’s impartiality, officially RSVPd no Thursday.

To read entire story, click here.