Politico has an article over the long weekend on how changes in Republican party rules could leave the nomination undetermined until the convention meets in Tampa. The authors are both connected with a Takoma Park, Maryland, outfit called FairVote, which favors the instant-runoff-ballot (take a look at their website for a definition) and opposes winner-take-all elections by which a plurality winner can prevail. They argue that a longstanding Republican party prohibition of the “unit role” provides a basis for overturning state laws and state Republican party rules which provide for winner-take-all allocation of delegates. Such provisions were common up to and including the 2008 campaign cycle; for the 2012 cycle a new Republican rule allows winner-take-all allocation only for primaries and caucuses held after April 1.