FACTBOX: Calendar of U.S. presidential primaries

(Reuters) - Here is a calendar of the remaining 2008 U.S. presidential nominating state primaries and caucuses. In some states the contests are non-binding and separate caucuses or conventions are scheduled to select delegates to the national conventions.

APRIL

* April 22: Pennsylvania

MAY

* May 6: Indiana, North Carolina

* May 13: Nebraska (Republican), West Virginia

* May 16-18: Hawaii's Republican Party will conduct its state convention; delegates are selected during a week-long process.

* May 20: Kentucky, Oregon

* May 27: Idaho (Republican)