My opinion is that Huckabee doesn’t really run on anything. His big government record aligns him ideolologically with McCain.
I believe that Huckabee was helping McCain by siphoning up some of the “conservative” vote from Romney. Now that Romney is out, Huckabee who attacked Romney often, has no attacks for McCain. I would think even Huckabiites would find this a little puzzling. This leads me to think that his sole purpose was to help McCain against Romney.