Charles Timothy "Chuck" Hagel (born October 4, 1946) is a former United States Senator from Nebraska. A member of the Republican Party, he was first elected in 1996 and was reelected in 2002. In 2009, he was elected as Chairman of the Atlantic Council.

Born in North Platte, Nebraska, to Betty Dunn Hagel and Charles Dean Hagel, who had German and Polish ancestry, he graduated from St. Bonaventure High School (now Scotus Central Catholic High School) in Columbus, Nebraska, the Brown Institute for Radio and Television in 1966 and the University of Nebraska at Omaha in 1971. Hagel is a Vietnam War veteran, having served in the United States Army infantry, attaining the rank of Sergeant (E-5) from 1967 – 1968. He served as an infantry squad leader in the 9th Infantry Division. While serving during the Vietnam War, Hagel received the Vietnamese Cross of Gallantry, two Purple Hearts, Army Commendation Medal, and the Combat Infantryman Badge.^{[citation needed]} After returning from Vietnam, he worked as a bartender and radio newscaster while finishing college.

Joseph Isadore "Joe" Lieberman (born February 24, 1942) is the senior United States Senator from Connecticut. A former member of the Democratic Party, he was the party's nominee for Vice President in the 2000 election. Currently an independent, he remains closely affiliated with the party.

Born in Stamford, Connecticut, Lieberman is a graduate of Yale University and Yale Law School. He was elected as a "reform Democrat" in 1970 to the Connecticut Senate, where he served three terms as Majority Leader. After an unsuccessful bid for the U.S. House of Representatives in 1980, he served as state Attorney General from 1983 to 1989. Lieberman defeated moderate Republican Lowell Weicker in 1988 to win election to the United States Senate and was re-elected in 1994 and 2000. In the 2000 United States presidential election, Lieberman was the Democratic nominee for Vice President, running with presidential nominee Al Gore, becoming the first Jewish candidate on a major American political party presidential ticket. He was an unsuccessful candidate for the Democratic presidential nomination in the 2004 presidential election.

Rafael Edward Cruz, known as Ted Cruz (born December 22, 1970), is the former Solicitor General of the U.S. state of Texas, a position which he held from 2003 to May 2008. Cruz was appointed by Texas Attorney General Greg Abbott. He was the first Hispanic Solicitor General in Texas, the youngest Solicitor General in the United States, and had the longest tenure in the post thus far in Texas history. He is currently a partner at the law firm Morgan, Lewis & Bockius, where he leads the firm’s U.S. Supreme Court and national appellate litigation practice.

Cruz is a candidate for the 2012 Republican nomination for the United States Senate seat being vacated by Kay Bailey Hutchison.

Cruz previously served as the director of the Office of Policy Planning at the Federal Trade Commission, an Associate Deputy Attorney General at the United States Department of Justice, and as Domestic Policy Advisor to U.S. President George W. Bush on the 2000 Bush-Cheney campaign. In addition, from 2004-2009 Cruz was an Adjunct Professor of Law at the University of Texas School of Law in Austin, where he taught U.S. Supreme Court litigation.

John Sidney McCain III (born August 29, 1936) is the senior United States Senator from Arizona. He was the Republican presidential nominee in the 2008 United States election.

McCain followed his father and grandfather, both four-star admirals, into the United States Navy, graduating from the U.S. Naval Academy in 1958. He became a naval aviator, flying ground-attack aircraft from aircraft carriers. During the Vietnam War, he was almost killed in the 1967 USS Forrestal fire. In October 1967, while on a bombing mission over Hanoi, he was shot down, seriously injured, and captured by the North Vietnamese. He was a prisoner of war until 1973. McCain experienced episodes of torture, and refused an out-of-sequence early repatriation offer. His war wounds left him with lifelong physical limitations.

He retired from the Navy as a captain in 1981 and moved to Arizona, where he entered politics. Elected to the U.S. House of Representatives in 1982, he served two terms, and was then elected to the U.S. Senate in 1986, winning re-election easily four times, most recently in 2010. While generally adhering to conservative principles, McCain at times has had a media reputation as a "maverick" for his willingness to disagree with his party on certain issues. After being investigated and largely exonerated in a political influence scandal of the 1980s as a member of the Keating Five, he made campaign finance reform one of his signature concerns, which eventually led to the passage of the McCain-Feingold Act in 2002. He is also known for his work towards restoring diplomatic relations with Vietnam in the 1990s, and for his belief that the war in Iraq should be fought to a successful conclusion. McCain has chaired the Senate Commerce Committee, opposed spending that he considered to be pork barrel, and played a key role in alleviating a crisis over judicial nominations.

Colin Luther Powell ( /ˈkoʊlɨn/; born April 5, 1937) is an American statesman and a retired four-star general in the United States Army. He was the 65th United States Secretary of State, serving under President George W. Bush from 2001 to 2005. He was the first African American to serve in that position. During his military career, Powell also served as National Security Advisor (1987–1989), as Commander of the U.S. Army Forces Command (1989) and as Chairman of the Joint Chiefs of Staff (1989–1993), holding the latter position during the Gulf War. He was the first, and so far the only, African American to serve on the Joint Chiefs of Staff.

Colin Luther Powell was born on April 5, 1937 in Harlem, a neighborhood in the New York City borough of Manhattan, to Jamaican immigrant parents Maud Arial (née McKoy) and Luther Theophilus Powell. He also has Scottish ancestry. Powell was raised in the South Bronx and attended Morris High School, a former public school in the Bronx, from which he graduated in 1954. While at school, he worked at a local baby furniture store where he picked up Yiddish from the shopkeepers and some of the customers. He received his Bachelor of Science degree in geology from the City College of New York in 1958 and was a self-admitted C average student. He was later able to earn a Master of Business Administration degree from the George Washington University in 1971, after his second tour in Vietnam.