I mean the venerable John Paul Stevens, Justice of the US Supreme court! How he got to become a Liberal over the space of three decades:
[....Justice Stevens, the oldest and arguably most liberal justice, now finds himself the leader of the opposition. Vigorous and sharp at 87, he has served on the court for 32 years, approaching the record set by his predecessor, William O. Douglas, who served for 36. In criminal-law and death-penalty cases, Stevens has voted against the government and in favor of the individual more frequently than any other sitting justice. He files more dissents and separate opinions than any of his colleagues. He is the court’s most outspoken defender of the need for judicial oversight of executive power. And in recent years, he has written majority opinions in two of the most important cases ruling against the Bush administration’s treatment of suspected enemy combatants in the war on terror — an issue the court will revisit this term, which begins Oct. 1, when it hears appeals by Guantánamo detainees challenging their lack of access to federal courts.
Stevens, however, is an improbable liberal icon. “I don’t think of myself as a liberal at all,” he told me during a recent interview in his chambers, laughing and shaking his head. “I think as part of my general politics, I’m pretty darn conservative.” Stevens said that his views haven’t changed since 1975, when as a moderate Republican he was appointed by President Gerald Ford to the Supreme Court. Stevens’s judicial hero is Potter Stewart, the Republican centrist, whom Stevens has said he admires more than all of the other justices with whom he has served. He considers himself a “judicial conservative,” he said, and only appears liberal today because he has been surrounded by increasingly conservative colleagues. “Including myself,” he said, “every judge who’s been appointed to the court since Lewis Powell” — nominated by Richard Nixon in 1971 — “has been more conservative than his or her predecessor. Except maybe Justice Ginsburg. That’s bound to have an effect on the court.”
As a result, Stevens is now in the unexpected position of shaping the court’s liberal jurisprudence. With the retirement of Justice Harry A. Blackmun in 1994, Stevens became the senior associate justice, a position second in authority only to the chief justice. When the chief justice is in the majority and Stevens is in the minority, Stevens decides who will write the principal dissent; when the roles are reversed, Stevens assigns the majority opinion. On the current court, in close cases, Stevens has wielded this power strategically, assiduously courting Kennedy to maximize the chances of winning five votes. In some instances, Stevens has assigned majority opinions to Kennedy to secure his vote; in others he has chosen to write majority opinions himself in ways that will persuade Kennedy to stay in the liberal camp......]
