Pierce said he and the others went along to present a solid Republican front, despite misgivings.
"We were uncomfortable with it to start with and went along with it thinking it was good for the caucus," Pierce said. "We really didn't want to vote for it, but we made a mistake and now we're trying to do what's right and correct it."
But their letter also said while the intent of their vote "was to create a shield for all citizens' religious liberties, the bill has been mischaracterized by its opponents as a sword for religious intolerance."
The bill allows any business, church or person to cite the law as a defense in any action brought by the government or individual claiming discrimination.