The only agenda I can figure so far is a government divide and conquer strategy. Their chief spokesperson wasn't inflammatory enough and he didn't say enough anti-gay rhetoric in order to play into the establishment's goal of pinning gays against fundamentalists and vice versa.
In other words, I see the entire idea of a "gay agenda" as a fabrication that involves the elite using their powers to push gay people with more extreme viewpoints towards the top of various societal power centers such as education, government, etc. in order to make it appear that most gay people want to use government to make their lifestyle a forefront of society and force everybody to accept it everywhere or whatever the fundamentalist argument of the day is.
There was an article in our local rag recently about the local govt. approving the structure permits for a new Chick-fil-A coming to town. They mentioned the Boston Mayor decision recently. Our town is very gay friendly. Over 95% of the comments were either people saying that they should allow it no matter what, and if you disagree with their views so strongly then don't go there, or to just simply to boycott their restaurant, including gay folks. Only ONE commenter, who probably isn't even gay, said that the mayor should follow the lead of the Boston Mayor and not allow "Chick-fil-hate", nobody else agreed. The fact is most gay people are not rabid political extremists or super-statists. They just want to be treated equally.