Nick Espinosa is an activist for immigrant and worker’s rights best known for his glitter bombing of Republican politician Newt Gingrich last month. Espinosa, 24, has been an activist for years, but it was only recently that he discovered the power of humor and theatrics in politics. “Feel the rainbow, Newt!” he said as he poured silver glitter onto Gingrich at a book signing. “Stop the hate. Stop anti-gay politics. It’s dividing our country and it’s not fixing our economy.” And then security pushed him away.

Glitter bombing is controversial, but it is catching on, with another activist recently catching Michele Bachmann and Tim Pawlenty unawares. But Espinosa doesn’t understand the concern that glitter bombing is violent or even, ...