MO HB1963

Requires voters to register with a specific party affiliation and restricts primary election voting to the party designated on their voter registration, effective for all primary elections held after January 1, 2013.

Allows voters to update or change their party affiliation at any time before the registration deadline for an election, with changes after that deadline effective only for subsequent elections.

Mandates that voter identification cards include party affiliation information and that election authorities notify voters registered without a party affiliation that they may change or update their party affiliation.

Makes it a class four election offense (misdemeanor) for any person to attempt to vote or vote a primary election ballot of a political party other than the one designated in their voter registration.

Modifies voting machine and electronic voting system requirements to ensure they permit voters in primary elections to vote only for candidates of the political party designated in the voter's registration.