Open primaries should be eliminated. Not only should members of political parties be allowed to select their own nominees, but open primaries provide too many opportunities for mischief by their political foes. We saw this in 2008, when Rush Limbaugh organized “Operation Chaos,” urging his listeners to vote for Hillary Clinton in the Democratic primaries at a time when Barack Obama had seemingly wrapped up the nomination. I led a similar campaign during the Michigan primary — which was meaningless on the Democratic side — urging my readers to vote for Mitt Romney as a way to try and extend...