Marching is sexy, fun, a group experience which makes one feel empowered, and "heard'. It offers the immediate payoff of a shared social experience.

Voting is boring, solitary, and offers no immediate gratification.

What is fascinating, is that people with education know the value of delayed gratification, and how a longer-term investment in something pays off. 

I am sure there were many, many educated people in the marches.

I am certain that the percentage of marchers who did not vote, could have easily turned the election away from a Trump victory (which amounted to something like a grand total of 55,000 votes in but three states. One article I read had it down to but a handful of counties that each of those states had that could have turned things around).

Many of the people who marched yesterday, likely did not practice what they learned in school, and missed their opportunity to have their beliefs counted where it mattered - in the ballot box.