Interesting. I am curious if getting married causes a shift right or if there is self-selection going on where the more right leaning females are getting married leaving singles as a more  left leaning demographic. Or perhaps it’s age related: younger people tend to be more idealistic (naive?) and start off unmarried but over time both things tend to naturally shift (but are not necessarily causally linked, just correlated). Would be interesting to control for some variables and see what that reveals.