Political Parties - As introduced, prescribes a process by which a person must declare a statewide political party or recognized minor party affiliation before voting in a primary election; designates unaffiliated registered voters as independents who have not affiliated with a political party prior to the primary election in August of 2026. - Amends TCA Title 2.

SB 123 requires Tennessee voters to declare a statewide political party or recognized minor party affiliation before voting in primary elections. Unaffiliated voters who do not declare by August 2026 will be designated as "independent" and lose eligibility to vote in primaries. The bill adds a registration field for party affiliation, mandates declarations at a voter's first primary after the law's effective date, and restricts affiliation changes to more than 30 days before an election. It amends election code sections to enforce these requirements and update voting eligibility rules.