I'd be ok with only allowing Candidates meeting ballot access requirements in all 50 States as a cut-off for inclusion in the debates. The campaigns for each candidate attending should also be footing the bill for the venue, security, and the airtime. No tax money.
That's be a bunch more fair than the current system.
Which one is more credible.
1. A candidate on 50 states polling less than 0.4 percent, or
2. A candidate on 49 states polling 10 percent?