I'm the Only One
performed by Glee Cast; features Mark Salling

The race for McKinley High Senior Class President comes to an end, and someone is caught trying to fix the results. Coach Beiste challenges Sue over Cooter, and Sue's own election day arrives. Life gets more complicated for Quinn and Puck, Santana comes out to her family, and a shocking event imperils New Directions' plans for participating in the forthcoming show choir Sectionals competition.