It was challenged by a road contractor, Earle Asphalt, which had made a $1,500 donation to the Monmouth County Republican Committee.
Earle later realized the money might run afoul of the law, and requested reimbursement. The refund did not come within the law's 30-day time limit, and Earle was ruled ineligible for a project in Interstate 195.
The unanimous ruling says the time limit and the law are constitutional.
