Napolitano is more ideologically in-line with Johnson compared to Paul.
Ron Paul is really a man who loves the law. He believes that the Constitution is legitimate, must be followed, and that it allows States to do whatever the hell the want. He believes in the old left-wing ideology that people are allowed to vote/decide on the society they want.
Napolitano and Johnson, especially the latter, are more of the "morality trumps the Constitution". They talk more about natural rights, about how "right makes right" not "majority makes right". They seek to suck power away from any government, federal or state, and will be happy to let the federal government prevent the state government from interference in private lives. They're Constitutionalists except when it contradicts their morality.
Plan for eliminating the national debt in 10-20 years:
Specific cuts; defense spending: http://rolexian.wordpress.com/2011/01/03/more-detailed-look-a