Possibly one “Third Party” candidate? Most states have a “Third Party” automatically on the ballot. Here in Texas and in most other states there are two Libertarian and Green. Others may try to to circulate petitions to get on the ballot. It appears the author of this strip has been taken in by the press releases of one of those people circulating petitions.
In the Texas Senate race I will be ticking the box for Libertarian Ted Brown.