Conn. Gen. Stat. § 9-23a: When person admitted as an elector permitted to vote in primary. Exception.

(a) Except as provided in subsection (b) of this section, no person admitted as an elector after twelve o'clock noon on the last business day before a primary shall be permitted to vote in such primary.

(b) An applicant for admission or enrollment under section 9-26 shall be entitled to vote in a primary if he files his application for admission or enrollment with the town clerk before the day of the primary and is otherwise eligible to vote in the primary.