The notion is: they probably won't, but the ones who do would probably "come from an unusually dedicated and informed sub-set of American teenagers."
Matt himself is, despite appearances, already old enough to vote. His idea reminds me of one of my earliest political opinions. It was 1960. I was 9. I said: "If kids could vote, it would be a landslide for Nixon." It seemed so unfair! If only kids could vote.
Speaking of unfairness, the voting age changed from 21 to 18 in the year I turned 21. It was 1972, my first chance to vote for President, and suddenly all the 18 and up kids could vote too. Of course, I voted for McGovern. Now, to be realistic, if the voting age had been 18 all along, 1972 would still have been my first presidential vote. I was only 17 in 1968. It was so unfair. But I was able to inform my unduly conventional parents about my (unusually dedicated!) support for Eldridge Cleaver. Peace and Freedom!
Oh, I know what you're thinking. How did she get from Nixon to Cleaver in 8 years? It's called teenage.