US Territories (Puerto Rico, Guam, American Samoa, and the U.S. Virgin Islands) all have primary/caucus contests for the presidential nominations of both parties. They send delegates to the nominating conventions, yet cannot vote for the candidate in the general.
I'm not questioning why residents of US Territories cannot vote in the general, but why they get to send delegates to the nominating convention? Can anyone explain how or why this came to be?
Can citizens in U.S. Territories vote for President?No, the Electoral College system does not provide for residents of U.S. Territories, such as Puerto Rico, Guam, the U.S. Virgin Islands and American Samoa to vote for President. Unless citizens in U.S. Territories have official residency (domicile) in a U.S. State or the District of Columbia (and vote by absentee ballot or travel to their State to vote), they cannot vote in the Presidential election. Note that prior to the adoption of the 23rd Amendment, DC residents could not vote in the Presidential election.
The political parties may authorize voters in primary elections in Territories to select delegates to represent them at the political party conventions. But that process does not affect the Electoral College system.
http://www.archives.gov/federal-register/electoral-college/faq.html#territories