The debates and the two party system

So I've been watching the presidential and vice presidential debate and getting royally pissed off. From what it appears there are only two candidates that are running. The lack of alternative voices is maddening to me. The republicrats run the show and they both talk within their narrow parameters. As a green party member, I get ticked off that the greens don't have access to the debates. If there is ever to be change in America it has to come from alternative voices and from the margin. Change will not come from those in power who have a stake in maintaining the status quo.