CNN’s responses to Obama’s marriage announcement includes this one, from Republican National Committee Chairman Reince Priebus:

“Because our children’s future is best preserved within the traditional understanding of marriage, we call for a constitutional amendment that fully protects marriage as a union of a man and a woman, so that judges cannot make other arrangements equivalent to it. In the absence of a national amendment, we support the right of the people of the various states to affirm traditional marriage through state initiatives. Republicans recognize the importance of having in the home a father and a mother who are married. The two-parent family still provides the best environment of stability, discipline, responsibility, and character. Children in homes without fathers are more likely to commit a crime, drop out of school, become violent, become teen parents, use illegal drugs, become mired in poverty, or have emotional or behavioral problems. We support the courageous efforts of single-parent families to provide a stable home for their children. Children are our nation’s most precious resource. We also salute and support the efforts of foster and adoptive families. Republicans have been at the forefront of protecting traditional marriage laws, both in the states and in Congress. A Republican Congress enacted the Defense of Marriage Act, affirming the right of states not to recognize same-sex marriages licensed in other states.

“Unbelievably, the Democratic Party has now pledged to repeal the Defense of Marriage Act, which would subject every state to the redefinition of marriage by a judge without ever allowing the people to vote on the matter. We also urge Congress to use its Article III, Section 2 power to prevent activist federal judges from imposing upon the rest of the nation the judicial activism in Massachusetts and California. We also encourage states to review their marriage and divorce laws in order to strengthen marriage. As the family is our basic unit of society, we oppose initiatives to erode parental rights.”

NOM's Marriage Pledge, which Mitt Romney has signed, includes a pledge to support a federal marriage amendment.