But the law leaves open the possibility of having three or more in the final debate.
The candidates' schedules of public events were once again light today, the day before their third and final debate.
Only about half the voters said they watched or listened to the final Presidential debate.
On the day after the third and final presidential debate, the race was still considered a dead heat.
All three candidates debated for the first time on October 15, in the final debate before the general election.
Only a handful of speakers were left for final debate.
Indeed, many said they would ignore the final debate on Sunday.
The final debate was watched by an average television audience of 800,000 people.
The third and final debate before the primary is scheduled to take place on Thursday.
The final debate before the vote today was the result of a common initiative from the five candidates.