RICHMOND, Va. (AP) - Republican vice presidential candidate Sarah Palin mistook some of her own fans for hecklers Monday at a rally that drew thousands.

A massive crowd of at least 20,000 spread across the parking lot of Richmond International Raceway, and scores of people on the outer periphery more than 100 yards from the stage could not hear.

"Louder! Louder!" they began chanting, and the cry spread across the crowd to Palin's left. Some pointed skyward, urging that the volume be increased.

Palin stopped her remarks briefly and looked toward the commotion.

"I hope those protesters have the courage and honor to give veterans thanks for their right to protest," she said.