AP reports:

Moments before the platform vote, delegates voted overwhelmingly to ban states other than Iowa, New Hampshire and South Carolina from holding their 2012 primary or caucus votes before the first Tuesday in March. Those three states traditionally kick off the nominating process, but they were challenged this year by other states that moved up on the calendar.
Under the binding rule adopted Monday, Iowa, New Hampshire and South Carolina cannot hold their own votes before the first Tuesday of February 2012. This year, Iowa held its caucuses on Jan. 3, and New Hampshire and South Carolina held their primaries on Jan. 8 and Jan. 19, respectively.

Marc Ambinder predicts potential chaos.