One example that always comes to my mind is the 1980s-era alliance between Christian conservatives and a faction of radical-feminists in the U.S., in support of anti-pornography laws. This led to the oddity of radical-feminist Catharine MacKinnon supporting the work of anti-feminists like James Dobson on the Meese Commission.
I can't help but be reminded of this.

See also: Sam Harris and Christopher Hitchens being pattern-matched with anti-Arab racists.
This is a great article at Aeon magazine. The author argues that the new ideological dichotomy is going to be between people who have great faith in technology and human innovation (Up) and the people who believe that humans are much more tied to their biology and the Earth (Down).
LW of course is a very Up community.