Wisconsin does not require voter registration by party and voters can register to vote at the polls on election day. Voters may cast a ballot for one party only.

Tuesday 3 April 2012: 100 of 111 delegates to the Democratic National Convention are pledged to presidential contenders based on the results of the voting in today's Wisconsin Presidential Primary. A mandatory 15 percent threshold is required in order for a presidential contender to be pledged National Convention delegates at either the congressional district or statewide level.

• 66 district delegates are to be pledged proportionally to presidential contenders based on the primary results in each of the State's 8 congressional districts. (numbers as of 31 March 2012)
• CD 1: 7
• CD 2: 12
• CD 3: 8
• CD 4: 10
• CD 5: 6
• CD 6: 7
• CD 7: 8
• CD 8: 8
• In addition, 34 delegates are to be pledged to presidential contenders based on the primary vote statewide.
  • 22 at-large National Convention delegates
  • 12 Pledged PLEOs

Sunday 15 April 2012: County Caucuses. The first tier caucuses are held at the County or Assembly District level. These caucuses elect delegates to the second tier Congressional District caucuses.

Sunday 6 May 2012: Congressional District Caucuses - second tier. National Convention District-level delegates are elected according to the results of the primary.

Friday 8 June 2012: Administrative Committee Meeting and State Convention.

Prior to the State Convention, the Administrative Committee meets to elected National Convention Pledged PLEO and At-Large delegates according to the results of the primary.

The remaining 11 National Convention delegates consist of

• 11 Unpledged PLEO delegates:
• 7 Democratic National Committee members.
• 4 Members of Congress (1 Senator and 3 Representatives).
• 0 Governors.
• 0 Distinguished Party Leaders.

These 11 delegates and will go to the Democratic National Convention officially "Unpledged".

Notes

Note: The Wisconsin 2012 National Convention Delegate Plan calls for a 3 April 2012 Presidential Primary. However, according to code WI Statute 5.02(22) the Presidential Primary is to be held in February.

The state's Spring primary is to be held on 21 February 2012 and the state's Spring election is to be held on 3 April 2012. As of 1 May 2011, the Wisconsin Democratic Party is working with the state's legislative leadership to introduce a bill to move the Presidential Primary to the 3 April 2012 Spring election.

On 27 May 2011, AB 162 was introduced by state Representative Gary Tauchen (Republican) and cosponsored by state Representative Mary Lazich (Republican). The bill would move both the Presidential Primary and Spring election from the 3rd Tuesday in February to the 1st Tuesday in April. Companion bill, SB 115 was introduced on 1 June 2011 by Senator Mary Lazich (Republican).

On 30 September 2011, Governor Scott Walker signed SB 115 into law. The bill changes the date of the presidential preference primary from the 3rd Tuesday in February to the first Tuesday in April.