Now while I realize that is anectdotal, I'd like to look at that more. I was married briefly in my very early 20's, and I've been married to my second wife for well over 20 years now. I know lots of folks in that particular boat.
Could be a matter of social circles too. I’m in the software industry, my wife is in education, lots of liberals all around us. Even non-libs in the software industry tend to have commitment issues, lots of job changes, lots of buying new toys, not to mention the work hours that can be hard on relationships.