Evan Ravitz, an advocate for direct democracy, recently posted a video of Ralph Nader endorsing the idea of national ballot initiatives in the United States. He does not explicitly say that he supports former Senator Mike Gravel’s National Initiative for Democracy plan, but he does say that he supports a “binding national referendum.”
Other third party endorsers of the National Initiative include Neil Kiernan Stephenson (a Libertarian candidate for Congress), John Murphy (an independent candidate for Congress), Matt Reichel (a Green candidate for Congress), Thomas L. Knapp (an active Libertarian and current candidate for their presidential nomination), Michael Jingozian (an active Libertarian and 2008 candidate for their presidential nomination), Paul Jacob (an active Libertarian in the 1980s, involved with Ron Paul’s 1988 presidential campaign), and John Rensenbrink (co-founder of the Green Party of the United States).
(Full disclosure: I am involved with Senator Gravel’s campaign for national ballot initiatives, and I know Evan Ravitz through that effort. I also got both John Murphy and Matt Reichel to endorse the National Initiative.)