Argument: Open primaries favor best candidate over party affiliation
"Editorial: California should switch to open primary elections." Stanford Daily Editorial. May 12th, 2010: "Candidates must be evaluated on more than just their party identification in an open system, promoting greater voter involvement. The open system also empowers voters to make more of a choice than simply picking their party’s best candidate, allowing for the voter to better evaluate the race overall."
Daniel Hannan. "Conservative Democrats prove the case for open primaries." Telegraph.co.uk. July 18th, 2009: "Open primaries are the obvious answer to the recent parliamentary expenses scandal. They would allow local voters to weed out bad MPs as individuals, without prejudice to their party affiliation. And once one party adopted them, the others would almost certainly have to follow."