In general, the Supreme Court has strengthened the idea of equal protection. It has done this by striking down laws that violated this ideal. The most obvious example of such an action on the part of the Supreme Court was Brown v. Board of Education. In that case, the Court strengthened the ideal of equal protection by removing the doctrine that segregated facilities could somehow be compatible with the guarantee of equal protection. The Court has subsequently strengthened equal protection in cases such as Romer v. Evanswhere a law that denied gay people protection from discrimination.
Through such case as these, the Supreme Court has strengthened the idea of equal protection.