The plan to save America by killing the partisan primary

Can much of America’s current political dysfunction be traced back to one feature of our system: the partisan primary? And if so, what should be done about that?

Nevada voters will be tasked with assessing those questions when they go to the polls Tuesday, to vote on “Question 3” — a proposed overhaul of the state’s election system that would effectively kill the partisan primary (the elections in which Democratic and Republican voters choose their party nominees).

Instead, Nevada would have a nonpartisan primary, from which the top five candidates...