Among those who worry that hackers might sabotage election tallies, Ion Sancho is something of a hero. The maverick elections supervisor in Leon County, Fla., last year helped show that electronic voting machines from one of the major manufacturers are vulnerable...and would allow election workers to alter vote counts without detection. Now, however, Sancho may be paying an unexpected price for his whistle-blowing: None of the state-approved companies here will sell him the voting machines the county needs. I believe I'm being singled out for punishment by the vendors," he said. The trouble began last year when Sancho allowed a Finnish computer scientist to test Leon County's Diebold voting machines, a common type that uses an optical scanner to count votes from ballots that voters have marked. Some tests...showed that elections workers could alter the vote tallies by manipulating the removable memory cards in the voting machines, and do so without detection. Last month, California elections officials arranged for experts to perform a similar analysis of the Diebold machines and also found them vulnerable -- noting a wider variety of flaws than Sancho's experts had. A spokesman said Diebold will not sell to Sancho without assurances that he will not permit more such tests, which the company considers a reckless use of the machines.

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