I found this about North Dakota...remember this was one of Ron Paul's best states over 20% of the vote.
A Complete Filing Must Include
1. A Petition/Certificate of Nomination (SFN 2704) containing the signatures of 1,000 qualified North Dakota electors;
http://www.nd.gov/eforms/Doc/sfn02704.pdf
2. An Affidavit of Candidacy (SFN 2703);
http://www.nd.gov/eforms/Doc/sfn02703.pdf
3. A Statements of Interests (SFN 10172).
http://www.nd.gov/eforms/Doc/sfn10172.pdf
Unfortunately I doubt either Paul or Goldwater Jr. would sign an affidavit of candidacy, so we're confined to states that don't require a candidates' formal consent.