Question: Information:  - Tamaulipas, officially the Free and Sovereign State of Tamaulipas, is one of the 31 states which, with Mexico City, comprise the 32 Federal Entities of Mexico. It is divided into 43 municipalities and its capital city is Ciudad Victoria. The capital city was named after Guadalupe Victoria, the first President of Mexico.  - The Great Society was a set of domestic programs in the United States launched by Democratic President Lyndon B. Johnson in 196465. The main goal was the elimination of poverty and racial injustice. President Johnson first used the term "Great Society" during a speech at Ohio University, then unveiled the program in greater detail at an appearance at University of Michigan.   - The War on Poverty is the unofficial name for legislation first introduced by United States President Lyndon B. Johnson during his State of the Union address on January 8, 1964. This legislation was proposed by Johnson in response to a national poverty rate of around nineteen percent. The speech led the United States Congress to pass the Economic Opportunity Act, which established the Office of Economic Opportunity (OEO) to administer the local application of federal funds targeted against poverty.  - Nuevo León, or New Leon, officially the Free and Sovereign State of Nuevo León, is one of the 31 states which, with Mexico City, compose the 32 Federal Entities of Mexico. It is divided into 51 municipalities and its capital city is Monterrey.  - George Herbert Walker Bush (born June 12, 1924) is an American politician who was the 41st President of the United States from 1989 to 1993 and the 43rd Vice President of the United States from 1981 to 1989. A member of the U.S. Republican Party, he was previously a congressman, ambassador, and Director of Central Intelligence. He is the oldest living former President and Vice President. Since 2000, Bush has often been referred to as "George H. W. Bush", "Bush 41", "Bush the Elder", or "George Bush Senior" to distinguish him from his eldest son, George W. Bush, who became the 43rd President of the United States. Prior to his son's presidency, he was simply referred to as George Bush or President Bush.  - Iran (, also , ; ' ), also known as Persia, officially the Islamic Republic of Iran (' ), is a sovereign state in Western Asia. It is bordered to the northwest by Armenia, the "de facto" Nagorno-Karabakh Republic, and Azerbaijan; to the north by the Caspian Sea; to the northeast by Turkmenistan; to the east by Afghanistan and Pakistan; to the south by the Persian Gulf and the Gulf of Oman; and to the west by Turkey and Iraq. Comprising a land area of , it is the second-largest country in the Middle East and the 18th-largest in the world. With 82.8 million inhabitants, Iran is the world's 17th-most-populous country. It is the only country with both a Caspian Sea and an Indian Ocean coastline. The country's central location in Eurasia and Western Asia, and its proximity to the Strait of Hormuz, make it of great geostrategic importance. Tehran is the country's capital and largest city, as well as its leading economic center.  - The United States Senate is the upper chamber of the United States Congress which, along with the House of Representatives, the lower chamber, composes the legislature of the United States.  - William Arvis `` Dollar Bill '' Blakley ( November 17 , 1898 -- January 5 , 1976 ) was an American senator and businessman from the State of Texas . He served two incomplete terms as Senator , the first in 1957 , the second in 1961 . He was part of the conservative wing of the Texas Democratic Party and is remembered for running against liberal Democrat Ralph Yarborough in the 1958 election and losing to Republican John Tower in the 1961 special election , yielding the first Republican senator from Texas since Reconstruction .  - Texas is the second largest state in the United States by both area and population. Geographically located in the south central part of the country, Texas shares borders with the U.S. states of Louisiana to the east, Arkansas to the northeast, Oklahoma to the north, New Mexico to the west, and the Mexican states of Chihuahua, Coahuila, Nuevo León, and Tamaulipas to the southwest, while the Gulf of Mexico is to the southeast.  - The Tower Commission was commissioned on 1 December 1986 by U.S. President Ronald Reagan in response to the Iran Contra scandal. Reagan appointed Republican and former Senator John Tower of Texas, former Secretary of State Edmund Muskie, and former National Security Advisor Brent Scowcroft.  - Coahuila, formally Coahuila de Zaragoza, officially the Free and Sovereign State of Coahuila de Zaragoza, is one of the 31 states which, along with Mexico City, compose the 32 Federal Entities of Mexico. The state is located in Northeastern Mexico on the US border.  - Ralph Webster Yarborough (June 8, 1903January 27, 1996) was a Texas Democratic politician who served in the United States Senate from 1957 to 1971 and was a leader of the progressive or liberal wing of his party in his many races for statewide office. As a United States Senator, he was a staunch supporter and author of "Great Society" legislation that encompassed Medicare and Medicaid, the War on Poverty, federal support for higher education and veterans. He co-wrote the Endangered Species Act and was the most powerful proponent of the "Big Thicket National Preserve". He was the only southern senator to vote for all civil rights bills from 1957 to 1970 (including the Civil Rights Act of 1964 and the Voting Rights Act of 1965). Yarborough was known as "Smilin' Ralph" and used the slogan ""Let's put the jam on the lower shelf so the little people can reach it"" in his campaigns.  - John Goodwin Tower (September 29, 1925  April 5, 1991) was the first Republican United States senator from Texas since Reconstruction. He served from 1961 until his retirement on January 3, 1985, after which time he was appointed as the chairman of the Reagan-appointed Tower Commission that investigated the Iran-Contra Affair. He was George H. W. Bush's nominee for Secretary of Defense in 1989 but was rejected by the Senate, 5347.    Given the information above, choose from the list below the object entity that exhibits the relation 'position held' with the subject 'william a. blakley'.  Choices: - 12  - ambassador  - congress  - director  - director of central intelligence  - leader  - national security advisor  - politician  - president  - president of mexico  - senate  - senator  - sovereign  - united states senator  - vice president
Answer:
united states senator