Opponents of the pending Milwaukie-to-Portland MAX light rail extension have received a big boost with a $15,000 check from reclusive medical-products tycoon Loren Parks.

Parks, who has previously contributed millions to various conservative causes, offers a possible counterbalance to the deep-pocketed forces who favor light rail. Construction companies, trade unions, engineering firms and many others stand to benefit from the project, but there is no concentrated financial interest opposed to construction.