The very first Section of the Very First Article in our constitution says...
Article 1- President
Section 1: A President must be elected every 2 months during the last 2 days of the month. Candidates must have a running mate prior to the vote. The candidate with the most votes at the end of voting will be inaugurated the following day, on the first of the month.
You need a running mate or your run for president will be terminated by Scar