Only 30 states have held presidential primaries so far this year (counting the District of Columbia as a state). Twelve more states will be holding presidential primaries for at least one party. Future presidential primary dates are:

April 22: Pennsylvania
May 6: Indiana, North Carolina
May 13: Nebraska, West Virginia
May 20: Kentucky, Oregon
May 27: Idaho
June 1: Puerto Rico (Democrats only)
June 3: New Mexico (Republicans only), Montana, South Dakota

The only minor party presidential primaries to come are the Green and Constitution primaries in Nebraska. The Libertarian and Constitution Parties could have had their own presidential primaries in Idaho and Montana, but they chose not to, since those parties will have nominated before then.

On April 6, Democratic Party National Chair Howard Dean said any resolution of delegates for Florida and Michigan will be after all the presidential primaries have been held.