Republican presidential candidate Ron Paul has not received much attention from the media since Senator John McCain became the presumptive nominee.

However, Paul is far from giving up on his campaign. He recently received 16% of the vote in the Pennsylvania GOP primary, and his followers brought a Nevada state convention to a standstill over the weekend.

Paul appeared on CNN's American Morning on Monday to talk about the campaign and his new book, "The Revolution: A Manifesto."  He also suggested he "probably" won't be campaigning for John McCain.

"We need to change," Paul told CNN's John Roberts. "The big question is, which way are we going? ... There's not much difference between the three [candidates]."

"Do you have any interest in campaigning for John McCain?" Roberts asked

"Probably not," replied Paul. "Not unless he changes his tune -- like bring the troops home."

"How can you be a good Republican if you don't campaign for the Republican candidate?" Roberts wondered.

"Maybe you're a good Republican if you stand up for Republican principles," Paul asserted.

Paul then outlined his radical free market solutions for the economy, saying "We need to immediately balance the budget, pay down some of the debt, let people go back to work." He told Roberts that he would rely solely on the market to control the prices of food and fuel.

"If you turn it over to the market, wouldn't they just drill every untapped resource for more oil?" Roberts asked. "Where would the incentive be for alternative fuels?"

Paul insisted that "price" alone would be a sufficient mechanism. "The market is much smarter than anything the politicians can do," he asserted. "The market'll sort it out and decide which is the most efficient energy source."

This video is from CNN's American Morning, broadcast April 28, 2008.

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Partial Transcript

ROBERTS: Any time you are ever asked whether or not you would launch an independent candidacy for the president, you said, without fail, I'm a Republican, I'm a member of the Republican party. As a member of the Republican party, do you have any interest in campaigning for John McCain?PAUL: Probably not. Not unless he changes his tune. Like bring the troops home. He's the greatest proponent of the war.

ROBERTS: How can you be a Republican if you don't campaign for the Republican candidate? Particularly when you have an amazing well of support out there?

PAUL: Maybe you are a good Republican if you stand up for Republican principles. I would argue that leadership in the last few years has drifted from the Republican principles. More bureaucracy, more regulations, more entitlements, policing the world, but that is not what we stand for. I would say that our position is very much in tune with being a good Republican.