As the Republican Party struggles to broaden its appeal and modernize its outlook, it will make mistakes.

A such blunder came the week before last when the Republican National Committee, unanimously and without discussion, approved a resolution against same-sex marriage.

It affirms the committee's support "for marriage as the union of one man and one woman" and calls for the Supreme Court to defend "the sanctity of marriage." The best that can be said is that the language is vague. (I have no doubt the Supreme Court will agree that marriage is sacred, but it may leave it to the states to define it.)