Huckabee framed the issue in a way that exposes liberals on THEIR bigotry AND hypocrisy. Huckabee framed it in a way that forces them to support consenting adult polygamous marriage, too, or be branded as hypocritical bigots.
If libs support both same sex marriage and polygamy, then they can be said to be radical extremists.
It is an unwinnable situation for liberals.
Liberals have been hit with that argument a million times before and continually reject the connection or any other connection to other forms of marraige redefinition.
If Huckabee is not able to simply say that homosexuality is wrong and that he is against it then he will come off as weak on the issue and that is not leading on this issue at all.
For Huckabee to say that he is not anti-gay marraige but just pro-traditional marraige is the same typical wishy-washy non-principled stance that has been destroying the republican party.