Mix the nuts - I like this idea from Michael Barone: a bipartisan Presidential debate. "In the process viewers heard [in the 1987 precedent] the talking points and propaganda of not just one party but of two, and the prospect that the other side would soon get its turn to speak may have deterred candidates from the kind of cheap shots which would evoke cheers from a one-party audience. My impression, which was reinforced by reading the transcript this week, is that there were fewer of these than in the debates I've watched this year. And viewers got more of a preview of the arguments that would be made by either side once the nominees were determined, along with some basis to measure the candidates of one party against those of the other." (HT: Real Clear Politics)