What's the rush?

By all accounts, this year's election has been the most exciting and interesting in a generation.
There are more people voting than at any time in recent history and, based on all the pundits on television, it continues to draw wide interest.
What, then, is the rush to force out former Arkansas Gov Mike Huckabee and Sen. Hillary Clinton?
All the talk for the past several days has been speculation on whether either can continue a sustaintable campaign after today;s voting and both, to their credit, say it isn't over until it's over.