I have always believed that candidates for any public office should be willing to meet side by side with voters in a town hall-style setting and take questions from those voters. That gives voters the ability to ask their questions and to judge how candidates react and interact with those they seek to serve.
This would include all candidates, whether it be for U.S. Congress, commissioner, sheriff, city council, etc. If a candidate refuses to participate, I think it shows that the candidate may not really be concerned about the issues on the minds of voters they seek to represent.
So I hope that this year candidates for commissioner, city council, sheriff and next year for state and federal legislature will agree to a series of town hall meetings with their opponents, because an informed electorate is critical to a healthy democracy.