Question: The 45th Governor of Texas ran in the Texas gubernatorial election of 1990 against what candidate?

Context paragraphs:
Texas gubernatorial election, 2010: The 2010 Texas gubernatorial election was held on Tuesday, November 2, 2010, to elect the Governor of Texas.  Incumbent Republican Governor Rick Perry ran successfully for election to a third consecutive term.  He won the Republican primary against U.S. Senator Kay Bailey Hutchison.  The former Mayor of Houston, Bill White, won the Democratic nomination.  Kathie Glass, a lawyer from Houston and previous candidate for Texas Attorney General, won the Libertarian nomination.  Deb Shafto was the nominee of the Texas Green Party.  Andy Barron, an orthodontist from Lubbock, was a declared write-in candidate.

Texas gubernatorial election, 1966: The 1966 Texas gubernatorial election was held on November 8, 1966 to elect the Governor of Texas.  Incumbent Democratic Governor John Connally was easily reelected to a third term, winning 73% of the vote to Republican T.E. Kennerly's 26%.  The election is, to date, the last time that a candidate for Governor of Texas won more than 70% of the vote.

Texas gubernatorial election, 1857: The 1857 Texas gubernatorial election was held on August 3, 1857 to elect the Governor of Texas.  The election pitted Lieutenant Governor Hardin Richard Runnels against former President of the Republic of Texas Sam Houston and Lieutenant Governor hopeful French Smith.  Runnels won the election with 53% of the vote, becoming the only person to ever defeat Sam Houston in a political contest.

Texas gubernatorial election, 1990: The 1990 Texas gubernatorial election was held on November 6, 1990 to elect the Governor of Texas.  Incumbent Republican Governor Bill Clements did not run for re-election, so the election pitted Democrat Ann Richards against Republican Clayton Williams.  Richards narrowly defeated Williams on Election Day, winning 50% of the vote to Williams' 47%.  As of 2017, this is the most recent time a Democrat was elected Governor of Texas.

South Carolina gubernatorial election, 1966: The 1966 South Carolina gubernatorial election was held on November 8, 1966 to select the governor of the state of South Carolina, USA.  It marked the first time since the gubernatorial election of 1938 that the Democratic candidate faced opposition from a Republican candidate.  Governor Robert Evander McNair prevailed as the winner of the election and continued as the 108th governor of South Carolina, but Joseph O. Rogers, Jr had a respectable showing for the first Republican candidate in 28 years.

Texas gubernatorial election, 1998: The 1998 Texas gubernatorial election was held on November 3, 1998 to elect the Governor of Texas.  Incumbent Republican Governor George W. Bush was re-elected in a landslide over 4-term Democrat Texas Land Commissioner Garry Mauro, winning 68% of the vote to Mauro's 31%.  Bush's 37% margin of victory was the largest won by any candidate since 1966 and is, to date, the largest ever won by a Republican candidate.

Ann Richards: Dorothy Ann Willis Richards (September 1, 1933 – September 13, 2006) was an American politician and the 45th Governor of Texas from 1991 to 1995.  A Democrat, she first came to national attention as the state treasurer of Texas, when she delivered the keynote address at the 1988 Democratic National Convention.  Richards was the second female governor of Texas, and was frequently noted in the media for her outspoken feminism and her one-liners.

Texas gubernatorial election, 1972: The 1972 Texas gubernatorial election was held on November 7, 1972 to elect the Governor of Texas.  Incumbent Democratic Governor Preston Smith was running for reelection, but was defeated in the Democratic primary by businessman Dolph Briscoe.  Briscoe went on to win the election by a relatively small margin, winning 48% of the vote to Republican Henry Grover's 45%.  Raza Unida candidate Ramsey Muniz won 6%.

Kogi gubernatorial election, 2015: The 2015 Kogi Gubernatorial election was held on 21 November 2015 to determine the Governor for KOgi State. The gubernatorial election is to elect the governor of Kogi state; the official at the head of theexecutive branch of a state.  The last Kogi state gubernatorial election was held in 2011.  The incumbent Governor, Captain Idris Wada, ran for re-election against the former Governor, Prince Audu, the candidate of the All Progressives Congress.

George W. Bush: George Walker Bush (born July 6, 1946) is an American politician who served as the 43rd President of the United States from 2001 to 2009.  He was also the 46th Governor of Texas from 1995 to 2000.  After graduating from Yale University in 1968 and Harvard Business School in 1975, he worked in the oil industry.  Bush married Laura Welch in 1977 and ran unsuccessfully for the House of Representatives shortly thereafter.  He later co-owned the Texas Rangers baseball team before defeating Ann Richards in the 1994 Texas gubernatorial election.  Bush was elected president in 2000 after a close and controversial win over Democratic rival Al Gore, becoming the fourth president to be elected while receiving fewer popular votes than his opponent.

Supporting paragraphs: Texas gubernatorial election, 1990 Ann Richards
Answer: Republican Clayton Williams