- Caucus states are italicized while primary states are not. Several caucus states are missing from the list because they have not formalized the date on which their contests will be held in 2012. Colorado appears because the caucuses dates there are set by the state, whereas a state like Alaska has caucuses run by the state parties and as such do not have their dates codified in state law.
- States that have changed dates appear twice (or more) on the calendar; once by the old date and once by the new date. The old date will be struck through while the new date will be color-coded with the amount of movement (in days) in parentheses. States in green are states that have moved to earlier dates on the calendar and states in red are those that have moved to later dates. Arkansas, for example, has moved its 2012 primary and moved it back 104 days from its 2008 position.
Monday, January 16, 2012: Iowa caucuses*
Tuesday, January 24: New Hampshire*
Saturday, January 28:
Tuesday, January 31: Florida
Tuesday, February 7 (Super Tuesday): Alabama,
Saturday, February 11: Louisiana
Tuesday, February 14: Maryland, Virginia
Tuesday, February 21: Hawaii Republican caucuses (+87), Wisconsin
Tuesday, February 28: Arizona**, Michigan***
Tuesday, March 6: Massachusetts***, Ohio, Rhode Island, Texas, Vermont
Tuesday, March 13: Mississippi
Tuesday, March 20: Colorado caucuses****, Illinois (-42)
Tuesday, April 24: Pennsylvania
Tuesday, May 8: Indiana, North Carolina and West Virginia
Tuesday, May 15: Nebraska, Oregon
Tuesday, May 22: Arkansas (-104), Idaho, Kentucky
Tuesday, June 5: Montana (GOP -119), New Mexico***** and South Dakota
*New Hampshire law calls for the Granite state to hold a primary on the second Tuesday of March or seven days prior to any other similar election, whichever is earlier. Florida is first now, so New Hampshire would be a week earlier at the latest. Traditionally, Iowa has gone on the Monday a week prior to New Hampshire. For the time being we'll wedge South Carolina in on the Saturday between New Hampshire and Florida, but these are just guesses at the moment. Any rogue states could cause a shift.
**In Arizona the governor can use his or her proclamation powers to move the state's primary to a date on which the event would have an impact on the nomination. In 2004 and 2008 the primary was moved to the first Tuesday in February.
***Massachusetts and Michigan are the only states that passed a frontloading bill prior to 2008 that was not permanent. The Bay state reverts to its first Tuesday in March date in 2012 while Michigan will fall back to the fourth Tuesday in February.
****The Colorado Democratic and Republican parties have the option to move their caucuses from the third Tuesday in March to the first Tuesday in February.
*****The law in New Mexico allows the parties to decide when to hold their nominating contests. The Democrats have gone in early February in the last two cycles, but the GOP has held steady in June. They have the option of moving however.
Notes: