Question: When was the American politician which  Catherine E. Pugh lost primaries to born 

Context paragraphs:
Jim Petro: James M. Petro (born October 25, 1948) is an American politician from the Republican Party, and a former Ohio Attorney General.  Previously, Petro also served as Ohio State Auditor.  Petro was a candidate for the Republican nomination for Governor of Ohio during the 2006 Ohio primaries, but lost to Ken Blackwell.

Brad Klippert: Bradley Allen "Brad" Klippert (born June 27, 1957) is an American politician of the Republican Party.  He is a member of the Washington House of Representatives, representing the 8th Legislative District.  Klippert unsuccessfully ran in the primaries for United States Senate in both 2004 and 2006.

Jack E. Robinson III: Jack E. Robinson III (born May 12, 1960) is a former Republican politician from Massachusetts.  He ran for the United States Senate in 2000 against Ted Kennedy (Democratic) and Carla Howell (Libertarian), losing to Kennedy.  He ran for Secretary of the Commonwealth in 2002, losing to William F. Galvin, and for US House of Representatives in Massachusetts's 9th district in 2006, losing to Stephen Lynch.  In 2009, he ran against Scott Brown in the Republican primaries for the special election to fill Ted Kennedy's Senate seat, but lost to Brown in the primary.

Stephanie Rawlings-Blake: Stephanie C. Rawlings-Blake (born March 17, 1970) is an American politician and attorney who served as the 49th Mayor of Baltimore from 2010 to 2016, the second woman to hold that office.  She has also served as secretary of the Democratic National Committee and president of the United States Conference of Mayors.

Kate Mosher: Kate E. Perry Mosher (born Catherine E. Perry; July 11, 1836April 5, 1926) was an American woodcarving artist.

Diane Black: Diane Lynn Black ("née" Warren; born January 16, 1951) is an American politician who has been the U.S. Representative for Tennessee 's 6 congressional district since 2011.  The district includes several suburban and rural areas east of Nashville.  She is a member of the Republican Party.  Previously she was a member of the Tennessee Senate for the 18th district, which encompasses Robertson County and part of Sumner County.  She was floor leader of the State Senate Republican Caucus.  She is a candidate in the Republican primaries for the Tennessee gubernatorial election, 2018.

Steve Henry: Steve Henry (born October 8, 1953) is an American politician and orthopedic surgeon who was the 52nd Lieutenant Governor of Kentucky from 1995 through 2003.  He twice ran unsuccessfully in statewide elections, finishing third in Democratic primaries for the United States Senate in 1998 and for Governor of Kentucky in 2007.

Robert Gray (Mississippi politician): Robert Gray (born April 14, 1969) is an American politician and truck driver from the state of Mississippi who was the Democratic nominee for Governor of Mississippi in the 2015 election.  A Jackson native, Gray is an unmarried long-distance truck driver and former firefighter.  He defeated lawyer Vicki Slater and Dr. Valerie Short in the Democratic gubernatorial primary on August 4, 2015.  Gray received 50.9% of the vote while Slater received 30.3% and Short 18.8%.  Gray did not vote in the primaries as he was out of town for work and later expressed surprise at his win.  He operates a truck company known as Fancy Horse Transportation, Inc.

Georgette Berube: Georgette B. Berube (July 23, 1927 - February 16, 2005) was an American politician from Maine.  A Democrat, Berube served in the Maine Legislature for 26 years, including terms in both the Maine House of Representatives and the Maine Senate.  Berube served in the Maine House from 1970 to 1982 after being elected to represent her hometown of Lewiston.  Serving until 1982, Berube then ran in the Democratic primary for Governor of Maine, challenging incumbent Joseph Brennan.  She ran as a party outsider.  Berube, along with Republican Sherry Huber, lost the primaries but became the first women to run for Governor in Maine.  Two years later, she sought and won a seat in the Maine Senate, where she served until 1996.  Retiring temporarily in 1996, Berube was re-elected in 1998 and finished her political career in 2000.

Catherine E. Pugh: Catherine E. Pugh (born Crump; March 10, 1950), an American Democratic politician, is the 50th and current mayor of Baltimore City, Maryland.  Pugh has been involved in Maryland politics since 1999 when she served on the Baltimore City Council.  She has also held office in the Maryland House of Delegates and the Maryland Senate, serving as the Majority Leader from 2015 to 2016.  She first ran for Baltimore City mayor in 2011 and lost the primary to Stephanie Rawlings-Blake.  Pugh ran again in 2016 and won the primary against former Mayor Sheila Dixon.  Pugh then won the mayoral election on November 8, 2016 with 57% of the popular vote, and took office on December 6, 2016.  She is Baltimore's third consecutive female mayor.

Supporting paragraphs: Catherine E. Pugh Stephanie Rawlings-Blake
Answer: March 17, 1970