Comment: You/They are GOP delegates to the national convention

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You/They are GOP delegates to the national convention

and those are the rules that apply in Tampa. The fact that you are "bound" to Romney means that you cannot vote for any person other than Mittens on the first ballot. "Abstain" is not a person but, it is your option to exercise, if you so choose, for as many ballot rounds you want.

http://www.dailypaul.com/229408/yes-you-can-abstain

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―Emmet Fox