JEFF JACOBY: Why beg anyone to vote?

Registering to vote isn't complicated. By and large, Americans who don't vote don't want to vote. In 2008 the Census Bureau found that by far the largest share of unregistered voters (46 percent) reported that they were "not interested in the election [or] not interested in politics." Their nonparticipation is rational, and we should respect it.

Why should those of us who take voting seriously enough to go out of our way to register want to increase electoral participation by those who won't?