White T-shirts are a significant departure from the standard dress code in the Rayburn House Office Building on Capitol Hill. So when a couple dozen activists walked into a joint meeting of the Science and Administration committees Wednesday wearing bleached cotton instead of the typical pantsuits and striped ties, it was not surprising that someone dispatched a Capitol Police officer to stand guard in case things got out of hand. The T-shirts were imprinted with bold black letters that read "Got Paper?" or "Got Audits?" -- coded, chest-high messages that were directed at lawmakers to express the widespread concern that new computerized voting machines can be tampered with to swing elections.

The activists had come to Washington to push legislation that would mandate voter-verifiable paper records for every ballot cast in the nation, a reversal of a recent trend toward touch-screen computers that only tally votes electronically.