[munchler]

Citizens of Washington, DC are in the same boat. They can vote for president, but have no representation in congress.

[CobrastanJorji]

To nitpick: they have a representative, but she's not allowed to vote.

[munchler]

To double nitpick: She's a delegate, not a representative. There are also non-voting members from Puerto Rico, Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands.