Re: Rooting for the front runner...
People like to associate themselves with winners. It's not just sports either - I suspect there are at least some people who vote for candidates who are likely to win in various elections too. That's why so many campaigns will show poll #s that favor their candidate - to try to get support from the bandwagonners.
Even on this board, watch the "top 40 prospect" polls in winter - in several of them you will see postes say "I like prospect X best but he has no chance to win, so I will choose prospect Y."