The Green Party of the United States held primaries in several states in 2008. Cynthia McKinney won most of the primaries and was formally nominated as the party's nominee during the 2008 Green National Convention.
The Green Party held a mail-in primary in Florida on February 1.
The California primary took place on February 5. Ralph Nader won, despite not running for the nomination of the party.
The Illinois primary took place on February 5.
The Massachusetts primary took place on February 5. Six candidates appeared on the ballot. Ralph Nader won, despite not running for the nomination of the party.
The District of Columbia primary took place on February 12.
Mississippi held caucuses on March 1.
Mississippi held their vote on March 1.
The party also held a caucus and mail-in vote on March 4.
The delegates were assigned by a vote at the state convention on June 8.
Wisconsin selected their delegates at the "Wisconsin Green Party Spring Gathering and Presidential Preference Convention" on March 29. While only McKinney and Mesplay were on the ballot, several other candidates received votes as write-ins.
Ohio held a vote-by-mail primary from March 4 through April 4.
The Indiana caucuses were party-run rather than state-organized.
The Green Party of Connecticut assigned their delegates based upon a vote held at their annual meeting on April 26, 2008.
Maryland held a primary where voters could either mail-in their ballots before April 30 or vote in-person at the Maryland Green Party Annual Assembly on May 3.
South Carolina held a party convention on May 3.
Missouri held a state convention on May 10.
The Green Party of Pennsylvania's presidential caucuses were held April 13-May 10. These caucuses were party-sponsored rather than state-run.
The Nebraska primary took place on May 13.
The Iowa convention took place on May 17.
Montana appointed their eight delegates at a state convention on May 31.
The New York Green Party ballots were publicly counted on May 31. The primary was a party-run mail-in primary.
This primary awarded 28 of New York's 40 delegates. New York City held a separate primary to award the remaining 12 delegates.
The Minnesota party previously held a caucus and mail-in vote on March 4. The delegates, however, were assigned by a vote at the state convention on June 8.
The New Mexico Green Party held its vote on June 8. A total of seventeen votes were cast, with 11 going to McKinney, 4 votes going to "none of the above", and 1 vote each going to Kat Swift, Kent Mesplay, and Jesse Johnson.
A second vote awarding New York's remaining 12 delegates was held on June 8 in New York City to appoint a remaining 12 of New York's delegates.
The selection of Texas' delegation took place on June 14 at the state Green convention, held at S.H.A.P.E.'s Harambee Center in Houston.
The Michigan convention took place June 26âÂÂ27 at the Franke Center for the Arts in Marshall, Michigan.