[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/images/10/22/art.obamadesk.gi.jpg caption="Hate crimes measure heads to president's desk after Senate approval."]
WASHINGTON (CNN) - The Senate on Thursday passed groundbreaking legislation that would make it a federal crime to assault an individual because of his or her sexual orientation or gender identity.
The expanded federal hate crimes law now goes to President Barack Obama's desk. Obama has pledged to sign the measure, which was added to a $680 billion defense authorization bill.
The measure is named for Matthew Shepard, a gay Wyoming teenager who died after being kidnapped and severely beaten in October 1998.
Several religious groups have expressed concern that a hate-crimes law could be used to criminalize conservative speech relating to subjects such as abortion or homosexuality.
Attorney General Eric Holder has asserted that any federal hate-crimes law would be used only to prosecute violent acts based on bias, as opposed to the prosecution of speech based on controversial racial or religious beliefs.
Thursday's Senate vote approving the measure was 68-29.
Former President George W. Bush had threatened to veto a similar measure, but Obama brought a reversal of that policy to the White House.
Earlier this month, Obama told the country's largest gay rights group that the nation still needs to make significant changes to ensure equal rights for gays and lesbians.
"Despite the progress we've made, there are still laws to change and hearts to open," he said during his address at the dinner for the Human Rights Campaign. "This fight continues now and I'm here with the simple message: I'm here with you in that fight."
Among other things, Obama has called for the repeal of the ban on gays serving openly in the military - the "don't ask, don't tell" policy. He also has urged Congress to repeal the Defense of Marriage Act and pass the Domestic Partners Benefit and Obligations Act.
The Defense of Marriage Act defines marriage, for federal purposes, as a legal union between a man and a woman. It allows states to refuse to recognize same-sex marriages. The Domestic Partners Benefit and Obligations Act would extend family benefits now available to heterosexual federal employees to gay and lesbian federal workers.
More than 77,000 hate-crime incidents were reported by the FBI between 1998 and 2007, or "nearly one hate crime for every hour of every day over the span of a decade," Holder told the Senate Judiciary Committee in June.
–CNN's Dana Bash and Lisa Desjardins contributed to this story.