As far as I am aware, Ron Paul's name being placed in nomination won't have any effect on delegates being able to vote for him. Delegates who are bound to him will still be allowed to vote for him (like the bound Romney delegate in Utah in 2008). Unbound delegates will be allowed to vote for him either way. They can vote for anyone they want. I am not aware of any way in which a delegate who is allowed to vote for Ron Paul if he is up for nomination would not be allowed if he is not up for nomination.
The only two differences, by my understanding are:
1. The votes for him if he is not up for nomination will not officially count toward a potential Ron Paul victory. But they would still count against Romney's total. If Romney doesn't hit 1144 then we still go to a 2nd ballot. If he does, then the difference would be whether he officially wins 1800-400 or 1800-0, though the voting was identical.
2. The Ron Paul team gets 15 minutes to speak to try to convince people to vote for him. This is separate and distinct from a potential prime time speaking slot, which he may or may not get.M
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