He is a democrat. You know the same party as Obama and Hillary.
Clarke has been elected three times to the Sheriff's office as a Democrat, despite not belonging to any party. This has spurred criticism from the local Democratic Party.
Clarke explains his choice to run as a Democrat thusly on his website:
"Like me, most people question why the Office of Sheriff is a partisan election. I have never asked a person to vote for me because I run as a Democrat. I ask them to vote for me based on my 35-year commitment to keeping citizens safe. Most voters get it when it comes to public safety. There is no Democrat or Republican way to be a sheriff. The enemy is not the opposing party; the enemy is the criminal."