I think that it is true that delegates are not bound. The Ben Swann piece referred to an article by FairVote.org.
Here is that article.
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Our piece focuses on the Republican National Committee rules governing how delegates are chosen for the Republican national convention next August and what those delegates are bound to do – and not do -- at the convention. Our conclusion is that RNC rules conflict with the conventional interpretation of the meaning of upcoming primaries and caucuses, and may well lead to challenges to seating delegates at the Republican convention next summer.
While not predicting a “brokered convention,” we explain the legal and political arguments for why it might happen. The combination of Rule 38, widespread use of winner-take-all primaries, and a Republican electorate that to date is not thrilled with its announced presidential candidates may invite a convention challenge. Some critics, like Barone, have claimed that we misread Rule 38’s prohibition against what’s called “the unit rule,” but in fact they misunderstand our point.
Barone say we have it wrong that the unit rule ban doesn’t allow state parties to use winner-take-all primaries in which the plurality winner of a state earns all that state’s delegates. But we aren’t claiming that the rule prevents winner-take-all primaries (at least after April 1st, as the party in 2010 did vote to prohibit winner-take-all primaries before April 1st except in the four states given special rights: Iowa, Nevada, New Hampshire and, the one state using a winner-take-all primary, South Carolina).
Rather, we explain that the RNC rules’ provision on the unit rule make it clear that delegates aren’t bound to vote according to how most delegates from their state are voting. In fact, delegates can vote according to their own judgment and conscience, and that this is most likely to take place in a state where a state party’s winner-take-all rule has allowed a candidate to win all delegates primarily due to a split in the majority vote, or due to votes cast by non-Republican voters participating in the contest.
To explain our case, we look to the language of Rule 38, which was adopted in its current form in 1964. The rule states: “no delegate shall be bound by any attempt of any state or Congressional district to impose the unit rule.” The unit rule does not prohibit a state from using a winner-take-all primary in the same way that Rule 15(b) prohibits most states from using a winner-take-all primary when holding a contest earlier than April 1st. However, the unit rule does prohibit binding delegates to vote according to how a majority of delegates from their state vote – again, a scenario most likely to occur in a state using the winner-take-all rule.
As set out in the Rules of the Republican Party, delegates have the ability to vote according to the delegates’ preference, even if that is contrary to the outcome of each state’s primary. According to one source, the legal counsel for the Republican National Convention in 2008 stated: “[The] RNC does not recognize a state’s binding of national delegates, but considers each delegate a free agent who can vote for whoever they choose.” Thus, if a delegate were to challenge his or her ability to vote as a free agent, he or she would have grounds under Rule 38.
For further clarification on the meaning of Rule 38, it is instructive to look to the debate in 1964 when the RNC debated whether to strike the Rule 38 language from a proposed amendment that was adopted that year. The debate begins on page 64 of this source (source link below). The RNC voted 59 to 41 to keep the rule in the amendment, noting that it helped to clarify a longstanding practice that a delegate was free to take exception to the roll call, and was free to vote his or her preference. Those who sought to strike the rule feared that its inclusion in the rules would give delegates freedom from both a non-existent legal obligation and a moral obligation to vote according to instructions from their state. However, even these opponents of the rule admitted that there never has been any legal obligation for a delegate to do so.
http://www.fairvote.org/response-to...-party-rules-may-surprise-in-201#.T8A-k1KXiVT
Additional source used by FairVote:
http://library.constantcontact.com/download/get/file/1103565212150-4/1964+Unit+Rule+Debate.pdf
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A very pertinent bit from the linked PDF:
Page 66 of the PDF linked, at line 18:
"However, since yesterday's meeting I have discussed this suggestion with several other people who believe the adoption of this change in the rule and the attendant publicity which would be given to it would convince some delegates they are released not only from a legal obligation which they never had but also from a moral obligation which some of them do have."