Paulites have started actively lying to a ridiculous degree.

[Landslide Lyndon]

Also, Paul ninja delegates might be bound to vote for Mittens but they are completely free to vote for every plank they want to insert into the party platform during the convention (gold standard, denouncing foreign wars, etc.), many of which are anathema to Romney and mainstream Republicans.
Or they can reject Romney's choice of vice-president and choose Rand for all we know.