The candidacy of a Mercer County Sheriff candidate is being challenged. The objection has been filed by Jan Occhi of Keithsburg regarding Democratic candidate Ron Schoon. Mercer County Clerk Phyllis Bewley says the challenge involves petition signatures. The Mercer County Election Board will take up the issue next week. The primary is March 18th. Three other Democrats are running for sheriff–Jeff Dale, Dave Staley and Caryn Brokaw. And two Republicans are running–George Howard and Chris DeFrieze.