Marital happiness seems to have remained remarkably stable in the GSS data for the last 40 years. These are the charts for: very happy, pretty happy, not happy, and don't know. About 60% say very happy, 35% pretty happy. Not happy down at ~5%.
Gender breakdown as expected: Women slightly less happy than men across all of these. Generally consistent with research that women are lose satisfaction in relationships more quickly. Not a huge difference however.
Happiness by education level. Very little difference for the most recent year, a few mixed trends for past years. The "very happy" seem to have degrees, the "pretty happy" more likely to have a HS or below. Least happy seem to be in the below HS group across the years.
Republicans more happy in marriage than Dems. Pretty consistent trend. Independents battling with Dems for second place over the years.
College educated the most likely to be married. Decline in marriage a bit steeper for HS and below.
Republicans more likely to be married.
This one is just general happiness (not married people specifically). Look at that sharp decline. Men and women pretty much in lockstep though.
This question asked: is life exiting or dull?
Here is agreement with: a bad marriage is better than none at all. Very few people. Men a little higher.
Unrelated to marriage, I'm just glancing through some of the questions now. I had no idea support for Affirmative Action was so unpopular. Would have guessed a 50/50 split on partisan lines or something. Looks like support is around 20%
Expected political diff but even half of Dems don't support it.