Having Cake and Eating It Too
Although he claimed that this was not what his gubernatorial run was about, Arnold Schwarzenegger doesn't rule out White House ambitions in the future. At least this is one possible interpretation of his recent support for "Schwarzenegger Amendment".
However, according to August 2003 CNN/Gallup poll, only about 30% Americans support such initiative.
In the same time, Federal Marriage Amendment enjoys somewhat bigger support – around 40-50 %.
This shows that the opposition to gay marriages is less strong than opposition towards foreign-born citizens becoming US presidents. It also shows that at least some pro-gay rights liberals are in the same time closet anti-immigrant bigots.
Or, perhaps, all the attempts to separate individuals into easily defined and simplified political categories don't have much to do with complex reality?