Another reason to forgo public funding? What would his liability be if he took public funding knowing he was ineligible to be president?
-PJ
A more proactive action, would be to file a Writ of Mandamus with the Secretary of State (of an individual state, or more than one state), alleging a requirement for ballot access as a Presidential candidate should be: Presentation of Documented Proof of Eligibility.
This could be done well before an election, and its basis could be "unconstitutional spending of public/state funds" (for ballot listings of ineligible candidates). A follow-up motion, could ask for rights of discovery to candidate's birth certificates.