A few minutes ago on their Facebook Page Meet the Press asked "what questions would YOU like to ask the GOP candidates?" Here's the comment John Wren posted:

Iowa and 16 other states still have a neighborhood caucus-assembly system for nominating to the primary ballot. Grass Roots Rules by Christopher Hull (Stanford University Press) has demonstrated that, at least in the Iowa Caucus) they system overcomes the effects of big money and big power in the nominating process, leveling the playing field. What do you think of the caucus-assembly system as compared to the petition only or direct primary system that most states have adopted? Would petition only states be well served to explore a change to the neighborhood caucus system? (For more on the caucus-assembly system we have in Colorado, see http://www.COCaucus.org/)