Question: Which U.S. Senator won re-election to a third term in which  James Charles Slattery was the Democratic candidate in 2008?

Context paragraphs:
Carol Moseley Braun: Carol Elizabeth Moseley Braun, also sometimes Moseley-Braun (born August 16, 1947), is an American diplomat, politician and lawyer who represented Illinois in the United States Senate from 1993 to 1999.  She was the first female African-American Senator, the first African-American U.S. Senator for the Democratic Party, the first woman to defeat an incumbent U.S. Senator in an election, and the first female Senator from Illinois.  She was the only female U.S. Senator from Illinois until Tammy Duckworth who became the U.S. Senator from Illinois in January 2017.  From 1999 until 2001, she was the United States Ambassador to New Zealand.  She was a candidate for the Democratic nomination during the 2004 U.S. presidential election.  Following the public announcement by Richard M. Daley that he would not seek re-election, in November 2010, Braun began her campaign for Mayor of Chicago.  The former Senator placed fourth in a field of six candidates, losing the February 22, 2011, election to Rahm Emanuel.

United States Senate election in Alaska, 2008: The 2008 United States Senate election in Alaska was held on November 4, 2008.  Incumbent Republican U.S. Senator and former President pro tempore Ted Stevens ran for re-election to a seventh term in the United States Senate.  It was one of the ten Senate races that U.S. Senator John Ensign of Nevada, the chairman of the National Republican Senatorial Committee, predicted as being most competitive.  The primaries were held on Tuesday, August 26.  Ted Stevens was challenged by Democratic candidate Mark Begich, the mayor of Anchorage.

United States Senate election in Indiana, 2010: The 2010 United States Senate election in Indiana took place on November 2, 2010, alongside 33 other elections to the United States Senate in other states and elections to the United States House of Representatives and various state and local elections to fill Indiana's class III United States Senate seat.  Incumbent Democratic U.S. Senator Evan Bayh decided in February 2010 to retire instead of seeking a third term shortly after former U.S. Senator Dan Coats announced his candidacy for Bayh's contested seat.  No Democratic candidate submitted enough signatures by the deadline to run, leading Democratic officials to choose U.S. Congressman Brad Ellsworth to be the nominee.  The Libertarian Party nominated YMCA instructor Rebecca Sink-Burris, who had previously run against Evan Bayh in the United States Senate election in Indiana, 1998 but with less success than in this election.  Republican nominee and former U.S. Senator Dan Coats won the open seat.

United States Senate election in Kansas, 2008: The 2008 United States Senate election in Kansas was held on November 4, 2008.  Incumbent Republican U.S. Senator Pat Roberts won re-election to a third term.

Jim Slattery: James Charles Slattery (born August 4, 1948) is an American politician.  He served in the U.S. House of Representatives from 1983 to 1995 representing Kansas's 2nd congressional district as a Democrat, was the Democratic nominee for governor in 1994 and was the Democratic candidate for U.S. Senator in 2008.

United States Senate election in Utah, 2012: The 2012 United States Senate election in Utah took place on November 6, 2012, concurrently with the 2012 U.S. presidential election as well as other elections to the United States Senate and House of Representatives and as various state and local elections.  Incumbent Republican U.S. Senator Orrin Hatch won re-election to a seventh term against former state Senator and IBM executive, Scott Howell the Democratic candidate.

Vermont gubernatorial election, 1934: The Vermont gubernatorial election of 1934 took place on November 6, 1934.  Incumbent Republican Stanley C. Wilson did not run for re-election to a third term as Governor of Vermont.  Republican candidate Charles M. Smith defeated Democratic candidate James P. Leamy to succeed him.

Vermont gubernatorial election, 1940: The Vermont gubernatorial election of 1940 took place on November 5, 1940.  Incumbent Republican George Aiken did not run for re-election to a third term as Governor of Vermont, instead running for the United States Senate.  Republican candidate William H. Wills defeated Democratic candidate John McGrath to succeed him.

United States Senate election in Minnesota, 2002: The 2002 United States Senate election in Minnesota took place on November 5, 2002.  Incumbent Democratic U.S. Senator Paul Wellstone was running for re-election to a third term, but died in a plane crash eleven days before the election.  The Democratic-Farmer-Labor Party (DFL) chose former Vice President and 1984 Presidential candidate Walter Mondale to replace Wellstone on the ballot.  Mondale lost to Republican Mayor of Saint Paul Norm Coleman.  The day before the election, Independence Governor Jesse Ventura had appointed Dean Barkley (IP) to serve the rest of Wellstone's term.  As of 2017, this is the last Senate election in Minnesota won by a Republican.

Vermont gubernatorial election, 1930: The Vermont gubernatorial election of 1930 took place on November 4, 1930.  Incumbent Republican John E. Weeks did not run for re-election to a third term as Governor of Vermont.  Republican candidate Stanley C. Wilson defeated Democratic candidate Park H. Pollard to succeed him.

Supporting paragraphs: Jim Slattery United States Senate election in Kansas, 2008
Answer: Pat Roberts