For FREEPER in over 40 states (see post #14), sure it is.
The only quandary is for the TRUE swing states...which stands at about 7 right now.
FREEPER Residents in about 43 states could vote for Virgil Goode -- and such a vote would in no way effect the bottom-line outcome of this election.
If you're in a state which is sure to overwhelmingly go to one or the other, and you wish to enter a protest vote, then go ahead and make yourself happy.
I'm in a swing state, so I won't.