A paper clip almost undid a suburban city council candidate.Jose Guzman said his petition signatures to run for alderman in Waukegan were properly fastened in accordance with state law when he turned them in in November. He said he used a paper clip.But a photograph taken by the clerk’s office shows unfastened sheets, with a paper clip peeking out from beneath the sheets. A legal dispute over whether that clip was the fastener in question — and over whether a paper clip is sufficient binding under election law  …