On what date was the poll showing John Kennedy with 45 % with 38 % one  and Mary Landrieu?
Poll Source Dates administered Democrat: Mary Landrieu Republican: John Kennedy Lead Margin
Opinion polling for the United States Senate elections, 2008
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Rasmussen Reports October 21, 2008 53% 43% 10
Rasmussen Reports September 25, 2008 54% 41% 13
Rasmussen Reports August 17, 2008 56% 39% 17
Rasmussen Reports July 9, 2008 51% 45% 6
Southern Media/ Opinion Research June 26-June 28, 2008 45.8% 40.3% 5.5
Rasmussen Reports May 28, 2008 47% 44% 3
Mellman Group * May 17-May 20, 2008 49% 33% 16
Southern Media/ Opinion Research March 26-April 9, 2008 50% 38% 12
Survey USA December 6-December 10, 2007 46% 42% 4
Zogby International [ dead link ] November 29, 2007 38% 45% 7
SELECT Dates administered FROM table WHERE Republican: John Kennedy = 45% AND Democrat: Mary Landrieu = 38%
45% 38%