A reader cautions: “It’s not at all clear that more Democrats voted in MO than Republicans. Voters don’t have to declare party affiliation in a primary, all they have to do is ask for a Rep. or Dem. or Lib. ballot. Since Holden was seen as a weaker candidate than Claire McCaskill, Republicans were hoping he’d win; therefore, it’s suspected that many of them picked up a Democrat ballot. Hard to say how many crossed the lines this way, of course; I’d say the turnout was pretty evenly divided.”