I suggest to the GOP:
1) The Lincoln-Douglass Debate style (or, if you prefer, Cain-Gingrich) was a wildly successful opportunity for the candidates to fully express their visions for the future in a no-mud-zone atmosphere. This would be best when the field has narrowed to 2-3 candidates and you want to fully share the GOP's vision for the future.
2) C-SPAN for all debates.
2) Moderators: Thomas Sowell & Eric Bolling (economics); John Bolton & Liz Cheney (foreign policy & the military); Brit Hume, Charles Krauthammer, & Judge Andrew Napolitano (domestic policy, the Constitution, and the role of government); and Bill O'Reilly (because if you can't give a straight answer to the hard questions, you have no business being there).