Donating and voting for prop 8, and therefore not in favor of redefining their "institution of marriage" (ignorant as that may be on their part) is not plain and simple hate, it's clear that you didn't even bother to read the blog post if you're willing to trivialize this issue like that. Even if you don't respect Brendan's beliefs, beliefs that I certainly don't respect, please stop trying to turn this into a black and white, "tolerant" vs "bigot" issue.
At some point, all sorts of horrible "opinions" where just that -- opinions. Society shifts and those opinions become unacceptable and revolting. The political landscape has shifted a lot in 6 years, and being against marriage equality is rapidly becoming akin to being a racist or sexist, based on broad public opinion.
I look at it from a practicality standpoint: abolishing the state-recognized marriage institution and just leaving religions to squabble amongst each other while moving everyone to civil partnerships for the benefits is impractical. So marriage is going to have to be redefined, whether they like it or not.