Here is an example of how the delegate selection process is codified into law:
Quote:
California Elections Code
...Each delegate to the Republican National Convention shall use
his or her best efforts at the convention for the party's
presidential nominee candidate from California to whom the delegate
has pledged support until the person is nominated for the office of
President of the United States by the convention, receives less than
10 percent of the votes for nomination by the convention, releases
the delegate from his or her obligation, or until two convention
nominating ballots have been taken. Thereafter, each delegate shall
be free to vote as he or she chooses, and no rule may be adopted by a
delegation requiring the delegation to vote as a body or causing the
vote of any delegate to go uncounted or unreported.
http://law.justia.com/california/cod...6460-6461.html
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Other states with primaries have similar laws.