Well, I don't define activism as having a difference with Congress, necessarily. Example, nothing in the Constitution grants Congress the right to regulate medicinal marijuana. Yet, those justices who voted in favor of California's medical marijuana law, if we accept your definition of activism, would be considered activist, as they sided with the California state assembly over Congress and the executive branch.
My definition of activist follows more along the lines of what Gawain & Ceasar have said: whether they take a strict interpretation of the Constitution or they take a flexible interpretation of it.
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