The Ron Paul contingent just made itself heard during the presentation of credentials, with noticeable booing and heckling. Chairman Priebus appeared less than happy.
Update, 4:25 pm -- Paul delegates now shouting "Point of Order" while Sununu presents rule changes to convention. Audible frustration.
Update, 4:40 pm -- Paul's Maine delegates have now walked off the convention floor, per Buzzfeed's Rosie Gray.