A jock and a cheerleader break up and start competing with each other in a student body presidential election at their high school.

Agreed with DPG, keep them together for more conflict and subsequently more humour.

However; if you like the story as is, I would personalize it a little. Give us a point of view and a goal.

This would just be an example, yours would be different:
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"After a viscous break -up a scorned head cheerleader vows to win the school election against her cheating ex-boyfriend, the star QB who is on the fast track to Harvard."
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hope that helped, good luck with this!

I believe DPG makes a good point, there is more conflict if they are still together, especially when they begin using negative campaigning.?

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Wouldn't it be even funnier if you stand the premise on its head: what if they don't break up but both compete for the position? ?Can their romance survive the rivalry?