Why did Diebold's CEO quit?

Why could it be that Walden W. O'Dell has left his post at Diebold?

O'Dell, who abruptly resigned late Monday as chairman and CEO of the voting machine maker, will be replaced, at least temporarily, by Chief Operating Officer Thomas Swidarski.

Maybe it was a problem of image. In recent years, Diebold's products have come under increased criticism for security. O'Dell himself was thrust into the national spotlight when it was revealed that he wrote in a Republican fundraising newsletter that he was "committed to helping Ohio deliver its Electoral votes to the president next year."

Maybe it's because his company faces imminent securities fraud litigation surrounding charges of insider trading at Diebold?

O'Dell told an Associated Press reporter, "I wish Diebold well," before hanging up.

Maybe he was trying to please the company's investors. His good wishes apparently helped his former company's stock price, which saw an uptick on the news of O'Dell's resignation.

Or that he recognizes the folly in his decision to not sell voting machines in places that don't like the broken ones?

Or is it just for personal reasons? Yeah, I'll bet that's it.