Question: The Kentucky Democratic Presidential Primary took place on which date, the winner in each of Kentucky's six congressional districts was awarded all of that district's delegates, totaling 34?

Context paragraphs:
Arkansas Democratic primary, 2008: The Arkansas Democratic Presidential Primary took place on Super Tuesday, February 5, 2008, with 35 delegates at stake.  The winner in each of Arkansas's four congressional districts was awarded all of that district's delegates, totaling 22.  Another 13 delegates were awarded to the statewide winner, Hillary Clinton.  The 35 delegates represented Arkansas at the Democratic National Convention in Denver, Colorado.  Twelve other unpledged delegates, known as superdelegates, also attended the convention and cast their votes as well.

Kentucky Democratic primary, 2008: The Kentucky Democratic Presidential Primary took place May 20, 2008, and had 51 delegates at stake.  The winner in each of Kentucky's six congressional districts was awarded all of that district's delegates, totaling 34.  Another 17 delegates were awarded to the statewide winner, Hillary Clinton.  The 51 delegates represented Kentucky at the Democratic National Convention in Denver, Colorado.  Nine other unpledged delegates, known as superdelegates, also attended the convention and cast their votes as well.

Kentucky's congressional districts: Kentucky is currently divided into 6 congressional districts, each represented by a member of the United States House of Representatives.  After the 2010 Census, the number of Kentucky's seats remained unchanged.

Mississippi Democratic primary, 2008: The Mississippi Democratic Presidential Primary took place on March 11, 2008, with 33 delegates at stake.  The winner in each of Mississippi's four congressional districts was awarded all of that district's delegates, totaling 22.  Another 11 delegates were awarded to the statewide winner, Barack Obama.  The 33 delegates represented Mississippi at the Democratic National Convention in Denver, Colorado.  Seven other unpledged delegates, known as superdelegates, also attended the convention and cast their votes as well.

Georgia Democratic primary, 2008: The Georgia Democratic Presidential Primary took place on Super Tuesday, February 5, 2008, and had a total of 87 delegates at stake.  The winner in each of Georgia's 13 congressional districts was awarded all of that district's delegates, totaling 57.  Another 30 delegates were awarded to the statewide winner, Barack Obama.  The 87 delegates represented Georgia at the Democratic National Convention in Denver, Colorado.  Sixteen other unpledged delegates, known as superdelegates, also attended the convention and cast their votes as well.

Indiana Democratic primary, 2008: The Indiana Democratic Presidential Primary took place on May 6, 2008.  It was an open primary with 72 delegates at stake.  The winner in each of Indiana's nine congressional districts was awarded all of that district's delegates, totaling 47.  Another 25 delegates were awarded to the statewide winner, Hillary Clinton.  The 72 delegates represented Indiana at the Democratic National Convention in Denver, Colorado.  Twelve other unpledged delegates, known as superdelegates, also attended the convention and cast their votes as well.

Maryland Democratic primary, 2008: The Maryland Democratic Presidential Primary took place on February 12, 2008.  Nicknamed the "Potomac Primary" or the "Chesapeake Primary" because the District of Columbia and Virginia also held their primaries that day (and all three border the Potomac River), a total of 70 delegates were up for grabs in Maryland.  The winner in each of Maryland's eight congressional districts was awarded all of that district's delegates, totaling 46.  Another 24 delegates were awarded to the statewide winner, Barack Obama.  The 70 delegates represented Maryland at the Democratic National Convention in Denver, Colorado.  Twenty-nine other unpledged delegates, known as superdelegates, also attended the convention and cast their votes as well.

Louisiana Democratic primary, 2008: The Louisiana Democratic Presidential Primary took place on February 9, 2008, and had 56 delegates at stake.  The winner in each of Louisiana's seven congressional districts was awarded all of that district's delegates, totaling 37.  Another 29 delegates were awarded to the statewide winner, Barack Obama.  The 56 delegates represented Louisiana at the Democratic National Convention in Denver, Colorado.  Ten other unpledged delegates, known as superdelegates, also attended the convention and cast their votes as well.

Connecticut Democratic primary, 2008: The Connecticut Democratic Presidential Primary took place on Super Tuesday, February 5, 2008, with 48 delegates at stake.  The winner in each of Connecticut's five congressional districts was awarded all of that district's delegates, totaling 31.  Another 17 delegates were awarded to the statewide winner, Barack Obama.  The 48 delegates represented Connecticut at the Democratic National Convention in Denver, Colorado.  Twelve other unpledged delegates, known as superdelegates, also attended the convention and cast their votes as well.

Alabama Democratic primary, 2008: The Alabama Democratic Presidential Primary was held on Super Tuesday, February 5, 2008, and had a total of 52 delegates at stake.  The winner in each of Alabama's seven congressional districts was awarded all of that district's delegates, totaling 34.  Another 18 delegates were awarded to the statewide winner, Barack Obama.  The 52 delegates represented Alabama at the Democratic National Convention in Denver, Colorado.  Eight other delegates were chosen on March 1, 2008 during an Alabama Democratic Party Executive Committee meeting.  Those eight delegates attended the National Convention as officially unpledged.

Supporting paragraphs: Kentucky Democratic primary, 2008 Kentucky's congressional districts
Answer: May 20, 2008