The National Organization for Marriage (NOM) has condemned a federal judge's ruling striking down Wisconsin's ban on gay marriage.

NOM President Brian Brown accused U.S. District Court Judge Barbara Crabb and other judges who have ruled against similar bans in other states of imposing their opinions and trampling “on the people and their will.”

(Related: Judge says she did not order Wisconsin counties to issue marriage licenses to gay couples.)

Brown, who heads the largest and best known group opposed to marriage equality, used the case to promote NOM's upcoming March for Marriage, a one-day rally and march to the steps of the U.S. Supreme Court. Scheduled to headline the June 19 event are former Pennsylvania Senator Rick Santorum and former Arkansas Governor Mike Huckabee.

“So it's up to us – it's up to you – to correct this undemocratic attack by what amounts to judicial overloads who seem bent on destroying the most vital institution our nation has – marriage between a man and a woman, united so a child can have the love and nurture of both a mother and a father,” Brown said in a blog post.

“And in 10 days, at the 2nd annual March for Marriage, we have a tremendous opportunity to take a giant step towards showing our strong and unbending opposition to rulings like Justice Crabb's in Wisconsin.”