The Amendment BANS gay marriage. The Klan supports it.
The point of the headline is to increase the tally of articles which give "hits" as articles in support of homosexual marraige.
Thuse anyone doing a nexis/lexis search will find overwhelming numbers of stories in "support" of homosexual marriage. IOW, even those who oppose homosexual marraige will be portrayed as supporting homosexual marriage.
Opposition is Support. Very orwellian.