<p>Arguably the most conservative Justice in recent US Supreme Court history, <a href="https://www.thoughtco.com/a-profile-of-clarence-thomas-3303419" data-component="link" data-source="inlineLink" data-type="internalLink" data-ordinal="1"><strong>Clarence Thomas</strong></a> is well-known for his conservative/libertarian leanings. He strongly supports state&#39;s rights and takes a strict constructivist approach to interpreting the US Constitution. He has consistently taken political conservative positions in decisions dealing with executive power, free speech, the death penalty and affirmative action. Thomas is unafraid of voicing his dissent with the majority, even when it is politically unpopular.</p><p>President George W. Bush nominated <strong>Samuel Alito</strong> to replace Justice Sandra Day O&#39;Connor, who had decided to step down from the bench earlier in the year. He was confirmed by a vote of 58-42 in January of 2006. Aliton has proven to be the better of the Justices appointed by President Bush. Chief Justice John Roberts ended up being the deciding vote in favor of <a href="https://www.thoughtco.com/reasons-obamacare-is-and-will-continue-to-be-a-failure-3303662" data-component="link" data-source="inlineLink" data-type="internalLink" data-ordinal="1">keeping Obamacare</a>, to the befuddlement of many conservatives. Alito dissented in major opinions on Obamacare, as well as a ruling in 2015 that effectively legalized gay marriage in all 50 states. Alito was born in 1950 and could serve ont he court for decades to come.</p>While the confrontational style of Supreme Court Justice <b>Antonin Gregory &#34;Nino&#34; Scalia</b> is widely regarded as one of his less appealing qualities, it underscores his clear sense of right and wrong. Motivated by a strong moral compass, Scalia opposes judicial activism in all its forms, favoring instead judicial restraint and a constructivist approach to the interpretation of the Constitution. Scalia has stated on numerous occasions that the power of the Supreme Court is only as effective as the laws created by Congress.<p>From his appointment by President Ronald Reagan in 1986 until his death in 2005, Supreme Court Justice <strong>William Hubbs Rehnquist</strong> served as Chief Justice of the United States and became a conservative icon. Rehnquist&#39;s term on the High Court began in 1972, when he was appointed by Richard M. Nixon. He wasted no time in distinguishing himself as a conservative, offering one of only two dissenting opinions in the controversial 1973 abortion-rights case, <em>Roe v. Wade</em>. Rehnquist was a strong supporter of state&#39;s rights, as outlined in the Constitution, and took the concept of judicial restraint seriously, consistently siding with conservatives on the issues of religious expression, free speech and the expansion of federal powers.</p>As one of only two Justices to cast a dissenting opinion in the landmark 1972 abortion-rights ruling <i>Roe v. Wade</i>, many conservatives believe Associate Supreme Court Justice <b>Byron Raymond &#34;Whizzer&#34; White</b> would have secured his place in conservative history had it been his only decision. White nevertheless practiced judicial restraint throughout his career on the High Court and was nothing if not consistent in his support of state&#39;s rights. Although he was appointed by president John F. Kennedy, Democrats saw White as a disappointment, and White himself said he was most comfortable serving under conservative Chief Justice William Rehnquist and most uncomfortable in the very liberal Court of Chief Justice Earl Warren.