WASHINGTON -- One of the early speakers at Thursday's annual Conservative Political Action Conference kickoff didn't waste much time before launching

Emboldened by a belief that their political fortunes are on the rise, conservative activists descended Thursday on the capital city they love to hate, seeking to stoke what they consider a grass-rootsuprising against President Obamaand Democrats in Congress.

The annual Conservative Political Action Conference was once a venue for the right fringe of theRepublican Party, but in recent years it has drawn more mainstream party figures and now provides a stage for presidential aspirants to prove their conservative credentials.

This year's CPAC, which began Thursday and will run through Saturday, had a festival atmosphere, as thousands of jubilant activists turned the Marriott Wardman Park ballroom into a hive of old-guard conservatives and Don't Tread on Me "tea partiers" hungry for new leaders and messages that can carry the GOP out of the political wilderness.

It was, in the words of one speaker, "our Woodstock."

Featured speakers in the opening session included former Massachusetts governor Mitt Romney, who sought to turn the page on his 2008 presidential campaign by casting himself as a populist and every bit the conservative standard-bearer. He defended the policies of former president George W. Bush and his party's lockstep opposition to Obama's agenda, saying that Obama had "failed" and that the Democratic majority in Congress would "soon be out the door."

"If these liberal neo-monarchists succeed, they will kill the very spirit that has built the nation -- the innovating, inventing, creating, independent current that runs from coast to coast," Romney said. Pounding on the lectern as the audience leapt up, he declared: "And we won't let 'em do it."

The attendees stomped and screamed at the appearance of the surprise guest who introduced Romney: Scott Brown. "I'm the newly elected Republican senator from Massachusetts," Brown said. "Let me just say that one more time. I am the Republican senator from Massachusetts."

Former vice president Richard B. Cheney also made an unscheduled appearance, bounding out from behind the dark curtain with his daughter Liz. He received a hero's welcome, to cries of "Run, Dick, run!"