FACTBOX: Key dates in the presidential campaign

(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.

JUNE

* June 3: Montana, New Mexico (Republican), South Dakota

AUGUST

* August 25-28: Democratic National Convention in Denver

SEPTEMBER

* September 1-4: Republican National Convention in Minneapolis-St. Paul, Minnesota

NOVEMBER

* November 4: Election Day

Source: National Association of Secretaries of State

(To read more about the U.S. political campaign, visit Reuters "Tales from the Trail: 2008" online at blogs.reuters.com/trail08/)

(Writing by Paul Grant, Washington Editorial Reference Unit),