Washington, DC (LifeNews.com) -- Democratic presidential candidate Barack Obama celebrated Roe v. Wade on Tuesday as hundreds of thousands of pro-life advocates came to the nation's capital to condemn it. Obama said he's worried the Supreme Court is just one vote away from overturning the infamous ruling that allowed virtually unlimited abortions.

"Thirty-five years after the Supreme Court decided Roe v. Wade, it's never been more important to protect," legalized abortions.

Obama said the Supreme Court's 5-4 decision last April in upholding the national ban on partial-birth abortions could be a harbinger of things to come.

"With one more vacancy on the Supreme Court, we could be looking at a majority hostile to a women's fundamental right to choose for the first time since Roe v. Wade," Obama said.

"The next president may be asked to nominate that Supreme Court justice. That is what is at stake in this election," he added.

Obama, an Illinois senator and former member of the state's legislature, said he has a consistent 100% pro-abortion voting record with NARAL and Planned Parenthood.

"Throughout my career, I've been a consistent and strong supporter of [abortion]," he said.

Trying to contrast his pro-abortion views with those of Hillary Clinton and John Edwards, Obama said he was the only Democratic candidate to speak out against an abortion ban in South Dakota and against those trying to close a new Planned Parenthood abortion business in Aurora, Illinois.

Obama said that "Roe v. Wade is about more than a woman's right to choose; it's about equality."

"And so to truly honor that decision, we need to update the social contract so that women can free themselves, and their children, from violent relationship," Obama said ironically.

However, abortion advocates have frequently voted against unborn victims bills that would offer protection and justice to women and unborn children like Laci and Conner Peterson when they are victims of violent crimes.

And abortion has been more frequently used by sexual predators who abuse teenage girls and then coerce them into having abortions to cover up their crimes.