Kenton Ngo is a policy wonk. He dissects election data using mapping software and reads transportation bills. He hosts a video podcast on his blog, one that draws as many as 2,000 readers a week. Ngo is recognized at political rallies and has joined conference calls with Virginia Gov. Timothy M. Kaine, but he has never voted in a primary or general election. Ngo is 15 years old.

Podcasts, Blogs and the New Shape of Electoral Politics