The 2004 amendment was written by Citizens for the Protection of Marriage, who wrote in a pamphlet at the time that:
Proposal 2 is Only about marriage. Marriage is a union between husband and wife. Proposal 2 will keep it that way. This is not about rights or benefits or how people choose to live their lives. This has to do with family, children and the way people are. It merely settles the question once and for all what marriage is-for families today and future generations.The Alliance Defense Fund, which backed the similar constitutional amendment here in Arizona, has made similar statements.
Yet it was Patrick Gillen of the Thomas More Law Center who wrote the amendment for CfPM, and he was also behind the lawsuit that eliminated partnership benefits.
Clearly, these people cannot be trusted, and Arizona was wise to reject the similar constitutional amendment here.
UPDATE (May 14, 2008): The Michigan Supreme Court has upheld the denial of domestic partnership benefits as a result of their 2004 constitutional amendment.
UPDATE (November 16, 2008): Patrick Gillen was also lead counsel for the Dover Area School District in the Kitzmiller v. Dover case, in which he defended the failed attempt to inject intelligent design into the public schools.