Argument: Open primaries lend cred to third-party candidates
Susan Nielsen. "Open Oregon's primaries." Oregonian. October 13, 2008: "Opponents also say the top-two system will hurt minor parties. It is true that minor parties will lose their easy route to the general election. However, they may also gain a better chance to compete. For example, a liberal district might find itself with a Democrat and a Green Party member as the top two. The Green candidate would be elevated as a serious contender, rather than a token name, in the general."