The crowd of Tea Party hardliners and veterans demonstrators converged on the memorial on the National Mall, pushing through barriers.
Republican Senators Mike Lee and Ted Cruz, and former Alaska Governor Sarah Palin, were part of the protest even though Cruz and Lee are among the Tea Party legislators who refused to keep the Government operating unless Obama agreed to their demands on healthcare.
As the crowd entered the memorial plaza, they chanted "Tear down these walls" and "You work for us". They sang God bless America and other songs.
"Our vets have proven that they have not been timid, so we will not be timid in calling out any who would use our military, our vets, as pawns in a political game," Palin told the crowd.
The memorial has become a political symbol in the bitter fight between Democrats and Republicans over who is at fault since the shutdown began on October 1.
One speaker described Obama as a Muslim and urged the crowd to initiate a peaceful uprising. "I call upon all of you to wage a second American nonviolent revolution, to use civil disobedience, and to demand that this president leave town, to get up, to put the Koran down, to get up off his knees, and to figuratively come out with his hands up," said Larry Klayman of Freedom Watch, a conservative political advocacy group.
- AP