A MATTER OF PRIORITIESJosh Marshall is right. This is the sort of thing that should finish off any presidential candidacy, especially one supposedly being run on “national security credibility”http://www.newsday.com/news/local/longisland/ny-usrudy0619,0,2577021,print.storyRudolph Giuliani's membership on an elite Iraq study panel came to an abrupt end last spring after he failed to show up for a