One of Bush's contributors faces a setback in its campaign to steal him another election: California has banned the use of more than 14,000 electronic voting machines made by Diebold Inc. in the November election because of security and reliability concerns, Kevin Shelley, the California secretary of state, announced yesterday. He also declared 28,000 other touch-screen voting machines in the state conditionally "decertified" until steps are taken to upgrade their security. Mr. Shelley said that he was recommending that the state's attorney general look into possible civil and criminal charges against Diebold because of what he called "fraudulent actions by Diebold."