Also known as "Fair-weather fan".
People who only support sports teams that recently win championships and then claim they liked that team all along. These people can be highly annoying, approaching them may result in increased levels of stress and aggression. Frontrunners may claim they have a relative or were born in the state where the winning team is from. Do not trust them at any cost.
Mike:"I told you my Gators would win!"
Wes:"You go to UCF, frontrunner."