Jan. 19: South Carolina GOP primary. (South Carolina's Democratic primary, which is scheduled to take place on Jan. 29, is not affected by the decision.)
Jan. 29: Florida Democratic primary.
Feb. 5: More than 20 states, including California and New York, are scheduled to vote on a day dubbed "Tsunami Tuesday."
Not yet set: The dates of the New Hampshire primary and Iowa caucuses. Both states are compelled by state law to set dates at least a week before any other voting. Those dates would apply to both the Democratic and Republican contests.