Judicial activism, liberal versus reactionary
Judicial activism in liberal courts result in equal rights for Americans. Reactionary judicial activism consists of increasing the rights of corporations over Americans, such as keeping individual campaign contributions in check while allowing unlimited corporate donations. Or continuously letting Big Coal destroy mountains and fresh water streams and to hell with the locals.
*Update 8/6/10* Great analysis of 2 recent rulings in favor of gay marriage along with encouraging prognostication of how SCOTUS might rule.