Diebold, the controversial electronic voting machine manufacturer, is coming off a tumultuous week. Its chief executive, Walden O'Dell, resigned. It was hit with a pair of class-action lawsuits charging insider trading and misrepresentation, and a county in Florida concluded that Diebold's voting machines could be hacked. The counting of votes is a public trust. Diebold, whose machines count many votes, has never acted as if it understood this. Mr. O'Dell made national headlines when he wrote a fund-raising letter before the 2004 election expressing his commitment to help deliver the electoral votes of Ohio - where Diebold is based, and where its machines are used - to President Bush. Under pressure, Diebold barred its top officials from contributing to campaigns. But this month, The Plain Dealer in Cleveland reported that three executives not covered by the ban continued to make contributions. Diebold's voting machines have a troubled history. The company was accused of installing improperly certified software, which is illegal, in a 2002 governor's race in Georgia. Across the country, it reached a multimillion-dollar settlement with the California attorney general last year of a lawsuit alleging that it made false claims about the security of its machines.