From Richard Winger at Ballot Access News:
Mary Matalin, interviewed on television on May 5, mentioned that she had changed her voter registration from Republican to Libertarian that very day. She lives in Louisiana, a state with partisan registration. See the entire short interview here. She was careful to say that she still may vote Republican in November, but that she wanted to make a public statement of her libertarian views and a statement that she is not a knee-jerk Republican partisan. Thanks to Eric Garris for the link.