| Listed by Dates |
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| Democratic primaries are listed in blue. |
| Republican primaries are listed in red. |
| Multiparty primaries are listed in black. |
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| JANUARY 2008 |
- January 3:
- January 5:
- January 8:
- January 15:
- January 19:
- Nevada (caucuses)
- South Carolina (R primary)
- January 26:
- South Carolina (D primary)
- January 29:
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| FEBRUARY 2008 |
- February 1:
- February 5:
- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Colorado (caucuses)
- Connecticut
- Delaware
- Georgia
- Idaho (D)
- Illinois
- Kansas (D)
- Minnesota
- Missouri
- Montana (R)
- New Jersey
- New Mexico (D)
- New York
- North Dakota (caucuses)
- Oklahoma
- Tennessee
- Utah
- February 9:
- Louisiana
- Kansas (R)
- Nebraska (D)
- Washington (D)
- February 10:
- February 12:
- District of Columbia
- Maryland
- Virginia
- February 19:
- Hawaii (D) **
- Wisconsin
- Washington (R)
- February 25:
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| MARCH 2008 |
- March 4:
- Ohio
- Rhode Island
- Texas
- Vermont
- Massachusetts
- March 8:
- March 11:
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| APRIL 2008 |
|
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| MAY 2008 |
- May 6:
- May 13:
- May 20:
- May 27:
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| JUNE 2008 |
- June 3:
- Montana (D)
- New Mexico (R)
- South Dakota
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| AUGUST 2008 |
- August 25-28: Democratic National Convention in Denver, Colorado
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| SEPTEMBER 2008 |
- September 1-4: Republican National Convention in Minneapolis-St.
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| ** Hawaii’s Republican Party is not technically holding a presidential primary or caucus. The delegates will be selected during a week-long period tentatively ending on February 7, but they will not be committed to any candidates as part of the vote.
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