Mr. Franken is also trying to raise public doubt about an "undervote" -- suggesting that only machine error can explain why he received 12.2 percentage points fewer votes than did Barack Obama.

WSJ: Al Franken's Minnesota

Each has a unique design, so a systematic machine-related error is unlikely.

ECONOMIST: Physics

In Palm Beach and Broward Counties, Harris effectively shut down attempt to conduct manual recount the votes there when her office issued a ruling that "a counting error" means that a machine fails to read a properly marked ballot.

CNN: graphic

It was really about searching your machine logs, and learning where all your error codes are.

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