Must? No... those who didn't qualify for the debate stage have paid up and will be listed on primary ballots... but barring some upheaval, are simply running to push an agenda or for attention by the eventual winner.
   Even 10 is hard for the public to follow seriously. Get down to the 3 who caught the public's eye and wait for the big change in primary schedules. Several states got tired of having so much be decided by Iowa and N. Hampshire.