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Colorado · November 3, 2026 general election · Statewide ballot measure

Amendment 84: what your vote means

Mail ballot voter identification. On every Colorado ballot. Official sources checked October 22, 2026.

Amendment 84 · Citizen-initiated constitutional amendment (needs 55% to pass)

Mail ballot voter identification

Official ballot title (quoted exactly)

Shall there be an amendment to the Colorado Constitution requiring a voter to sign and include the last four digits of their social security number or their Colorado driver’s license or identification card number on the outside of their mail ballot for any federal or state election, and, in connection therewith, allowing the voter to correct missing or incorrect information, including with alternative forms of identification; and prohibiting a county clerk and recorder from counting the mail ballot unless the problem is fixed?

Ballot title as printed in the 2026 State Ballot Information Booklet (Blue Book), Colorado Legislative Council Staff.

A YES vote means:

Mail ballots in federal and state elections would need the last four digits of the voter’s Social Security number or Colorado driver’s license or ID number, in addition to a signature. Ballots with missing or wrong information would not count unless the voter fixes it.

A NO vote means:

The current signature-only verification of mail ballots continues.

What it would change

  • Who is affected: all Colorado voters who vote by mail, and county election offices.
  • Taxes and fees: none.
  • Fiscal impact (Legislative Council Staff): up to $2.7 million in state and local costs in 2026-27 and about $1.2 million a year after that; the state reimburses about 45% of county costs.

Official arguments, summarized

Short neutral summaries of the arguments printed in the official voters’ pamphlet. The committees that wrote them are responsible for their content. Read the full text at the link below.

Argument for

Supporters say an ID number check is more consistent than signature verification alone, strengthens election security and public confidence, and that voters without the required ID can still vote in person.

Argument against

Opponents say it adds a burden without meaningfully improving security, that eligible ballots could be rejected over minor mistakes, and that it could discourage mail voting by people with privacy concerns or without the required ID.

Arguments for and against Amendment 84, 2026 Blue Book, Colorado Legislative Council Staff (PDF, p. 25)

Who supports it and who opposes it

These lists come from official campaign filings (registered committees) and public endorsements, each linked to its source. They are not complete, and SaveYourState does not endorse anyone listed. Lists checked October 30, 2026.

Who supports it

Who opposes it

Official sources

SaveYourState is independent and nonpartisan, not a government site, and does not take positions on ballot measures. This explainer describes effects only, using the official ballot title, explanatory statement, full text, and fiscal impact statement. If anything here differs from those documents, the official documents control.