If the law is unconstitutional, then yes. If he overturned to because the law is "unfair", then no.
It depends on the grounds. If the law is unconstitutional, it must be overturned by a strict constructionist, if that question is put before the court, and the question is within the jurisdiction of that court.
However, overturning a law does not make a judge a strict constructionist. Many liberal activist judges have invented grounds to overturn laws they don't like.