If a candidate cancels his declaration of intent to solicit and receive contributions for a particular office, ceases to be a candidate or fails to qualify for an office for which contributions have been solicited or accepted, or if there remains a balance in a campaign checking account of a candidate or committee after the date of the election in which the candidate appeared on the ballot, all unexpended funds remaining in the account shall be returned on a pro rata basis to those who have made the contributions or be donated to one or more charitable organizations qualifying for federal income tax exemption within 90 days from the date a candidate withdraws from the race or the date of the election in which the candidate appeared on the ballot, whichever comes first. However, a maximum of $6,000.00 in unexpended funds may be retained by a candidate or committee and may be used for any political purpose or other lawful use. The provisions of this section shall apply retroactively to any unexpended funds in an account as of one (1) year from the date of adoption of this amendment.