Getting ballot access can be hard for smaller campaigns with fewer resources. Darrell Castle, the candidate for the Constitution Party, is on the ballot in more than two dozen states. Castle said his campaign has faced ballot access obstacles in California, Texas and Oklahoma. “Those states are virtually impossible for a party like mine because they cost so much money,” Castle said.

Castle isn’t on the ballot in Oklahoma. To be on the ballot there required signatures from at least 3 percent of all votes cast in the state in 2012, or about 40,000 signatures. Castle says this would likely require hiring professionals who often charge a few dollars for each signature.

Roque “Rocky” De La Fuente is running as an independent and is on the ballot in 20 states. As other non-major-party candidates have promised to do, De La Fuente has mounted several legal challenges for ballot access.