In recent years cross-voting, the practice of supporting or voting for an opposing party's second-best interest, has become increasingly popular. For example, in 2008 Rush Limbaugh hoped to dilute some of Barack Obama's momentum by founding "Operation Chaos" which encouraged conservatives to vote for Hillary Clinton. And now with Michigan's open primary, the Daily Kos is calling for Michigan Democrats to vote for Rick Santorum in order to make things difficult for Mitt Romney.
Rob Richie works at Fair Vote, a nonpartisan research advocacy organization promoting fair elections. Patricia Lesko is a Michigan Democrat who will not be participating in the open primary .