What I observed here in Maine was a very well organized team aimed at gaining national delegates and county delegates to the state committee.
They new the rules inside out, and were assisted at convention by one of the co-drafters of the current edition of Roberts Rules. Many of the mainstream/romney people were left slack jawed.
I would expect the same at the national convention.
Most of the states use primary systems and those delegates are bound to support the candidate receiving the most votes on the first ballot. E.g., the Paul delegates in Massachusetts who were able to get in a position to go to Tampa will have to vote for Romney on the first ballot.
Unless they have no plan on following that rule once they get there, I don't see much they can do to keep Romney from getting the nod.