Last summer, I tweeted about my experience clerking in the District of Arizona for the racial profiling trial of Joe Arpaio. That led to some news coverage and an op-ed in the Washington Post. It's nice to get recognition, but now that Arpaio has announced a senate run the stakes are quite serious.

Arpaio's career and the Arpaio pardon are among the most awful examples of where law enforcement has failed in this country. We rely on law enforcement, in this country, to carry out laws made by ot...