The Interregional Primary Plan breaks the country up into 6 geographical regions. The primary schedule spreads across several months with a primary date on various Tuesdays between March and June. On each primary date, at least one state from each regions votes, such that varying views across America are represented on each election date. The country is also split into six sub-regions that vote together. The initial order of sub-regions is determined by a lottery that creates a rotating cycle for subsequent elections. In a 24-year cycle, every sub-region will have had an opportunity to lead off the primary schedule.

Levin’s plan would break down the country into six regions, with six-sub regions. The schedule is as follows:

-- Second Tuesday in March
-- First Tuesday in April
-- Fourth Tuesday in April
-- Second Tuesday in May
-- Fourth Tuesday in May
-- Second Tuesday in June

The regions and sub-regions would be broken down in the following:

Region 1: (A) Maine, New Hampshire, Vermont; (B) Massachusetts; (C) Connecticut, Rhode Island; (D) Delaware, New Jersey; (E) New York; (F) Pennsylvania

Region 2: (A) Maryland; (B) West Virginia; (C) Missouri; (D) Indiana; (E) Kentucky; (F) Tennessee

Region 3: (A) Ohio; (B) Illinois; (C) Michigan; (D) Wisconsin; (E) Iowa; (F) Minnesota

Region 4: (A) Texas; (B) Louisiana; (C) Arkansas, Oklahoma; (D) Colorado; (E) Kansas, Nebraska; (F) Arizona, New Mexico

Region 5: (A) Virginia; (B) North Carolina; (C) South Carolina; (D) Florida; (E) Georgia; (F) Mississippi, Alabama

Region 6: (A) California; (B) Washington; (C) Oregon; (D) Idaho, Nevada, Utah; (E) Montana, North Dakota, South Dakota, Wyoming; (F) Hawaii, Alaska

Source: http://www.house.gov/apps/list/press/mi12_levin/pr031407.html