We've had polls like this in past with minority parties, but they fail to take into consideration the fact that they are unlikely put forward a candidate. That's what you vote for at the end of of the day, not the party.
I will do what I usually do and wait to see who pisses me off the most canvassing that morning then vote for the party that would piss them off the most.
If that fails I will waste my vote "electorally".. i.e. use my democratic right to vote for a party that hasn't got a chance in hell.