According to this Des Moines Register poll, Huck blows away other Republicans in Iowa on fav/unfav:

Mike Huckabee: 54 / 22

Sarah Palin: 37 / 55

Newt Gingrich: 42 / 36

Mitt Romney: 40 / 31

Tim Pawlenty: 17 / 10

Bobby Jindal: 16 / 10

George Pataki: 16 / 14