presidential debates

     Sometimes the candidates from the two major parties debate one another on television before a presidential election. Why don't we have a televised debate with every election? One that includes questions from the audience, or from viewers at home?  Nearly everyone has television available--the debates could be re-broadcast for those who might have missed them. Public debates should be a standard part of  elections--for president, governor, senator, congressional representative, and perhaps more local offices. Speaking in public is what those running for election want to do for a living, so it really shouldn't be considered a burden to be asked to speak in a debate neither candidate would be "running".