While I'd love to see Napolitano as a VP to Paul, Dr. Paul would be better keeping him aside as a potential supreme court nominee. The court needs a fresh injection of Constitutionalists. Kelo v. New London is a great example of why we need someone like Napolitano on the bench.
I like Gary Johnson, but the guy just can't seem to answer questions clearly enough without tripping all over himself. He'd would be too easily painted as a fool. Paul should find someone of like mind, with the same confidence and assertiveness as Dick Cheney. Like him or not, he didn't put up with any shit...
I remember an interview of Cheney a few years ago where the reporter asked about the Iraq war not being popular. Cheney's initial answer was "So?" The reporter paused in disbelief, expecting some type of political mealy-mouthed answer. I fell out of my chair laughing when I saw that.