Comment: You are correct...

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In reply to comment: Bound for 1st round? (see in situ)

You are correct...

Rules cannot be changed for a current convention at the convention. Any changes voted on this weekend in Texas are for the next election cycle and for 2016... Not this election cycle or this year. From my understanding in 2016 delegates are only bound in Texas for first round of voting and after that it's open for any vote from the second round on.