NYTimes.com:
“If there was ever a calendar that was designed for the nominating battle to go the distance, this is it,” said John Weaver, the chief strategist for the campaign of Jon M. Huntsman Jr., a former governor of Utah. “It could easily go into April and May.”
The unsettled calendar has created anxiety and opportunity for Republican candidates.
For all of the precision that presidential campaigns require, the process of selecting a nominee is dictated by a haphazard set of rules that vary by state. Some states conduct closed primaries (registered Republicans only), and others have open primaries (independents and Democrats can vote, too).