I suspect that as you may suspect that lawn obsessed behavior correlates poorly with more general rightish political tendencies in the general pop. As the older generation of local lawn obsesses bow to their infirmities, the new generation, so far somewhat less obsessed, seem more mainstream politically. While still susceptible to the siren call not only of overly frequent mowing, but to fertilizers and weed killers, they seem to be otherwise agreeable humans.
I had a more specific, very un-sympatico reaction. In the recent past, my neighborhood was populated by several lawn obsessed types who mowed their lawn 2, even 3 times a week. Imminent rain, especially thunderstorms (tornados are fairly rare here), seem to cause in them an uncontrollable urge to mow, lest the unmowed grass grow too much from the fresh rain to be outside acceptable limits. So it can be fairly common for them to mow through approaching lightning and thunder, right up to, and frequently past the arrival of downpours.
This is only part of a larger pattern of annoying behavior, including lecturing lawn slackards and remowing their lawns whenever neighbors have outdoor gatherings. Lawn signs seem to indicate a high correlation with Tea Party politics and a fondness for that fellow.
So I took this guy to be merely marginally more committed to the project of the perfect lawn (and by extension, the perfect libertarian world) than my neighbors. That is, anything but sympatico.
Maybe I observe here only a local correlation between excessively committed lawn behavior and excessive political beliefs.