WASHINGTON - Tens of thousands of protesters fed up with government spending marched to the U.S. Capitol on Saturday, showing their disdain for the president's health care plan with slogans such as "Obamacare makes me sick" and "I'm not your ATM."

The line of protesters clogged several blocks near the Capitol, according to the D.C. Homeland Security and Emergency Management Agency. Demonstrators chanted "enough, enough" and "We the People." Others yelled "You lie, you lie!" and "Pelosi has to go," referring to House Speaker Nancy Pelosi, a Democrat, like President Barack Obama.

Throngs of people waved U.S. flags and held signs reading "Go Green Recycle Congress" and "Obama Bin Lyin."' Men wore colonial costumes as they listened to speakers who warned of "judgment day" -- Election Day 2010, which some congressional seats are up for a vote.

Other signs -- reflecting the growing intensity of the health care debate -- depicted President Barack Obama with the signature moustache of Nazi dictator Adolf Hitler. Many referred to Obama as a socialist or communist, and another imposed his face on that of the villainous Joker from "Batman."

Richard Brigle, 57, a Vietnam War veteran and former Teamster, came from Paw Paw, Michigan. He said health care needs to be reformed -- but not according to Obama's plan.

"My grandkids are going to be paying for this. It's going to cost too much money that we don't have," he said while marching, bracing himself with a wooden cane as he walked.

FreedomWorks Foundation, a conservative organization led by former House Majority Leader Dick Armey, organized several groups from across the country for what they billed as a "March on Washington."

Organizers say they built on momentum from the April "tea party" demonstrations held nationwide to protest tax policies, along with growing resentment over the economic stimulus packages and bank bailouts.

Many protesters said they paid their own way to the event -- an ethic they believe should be applied to the government. They say unchecked spending on things like a government-run health insurance option could increase inflation and lead to economic ruin.