Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Poll Source | Dates administered | Democrat: Mary Landrieu | Republican: John Kennedy | Lead Margin |
| --- | --- | --- | --- | --- |
| Rasmussen Reports | October 21, 2008 | 53% | 43% | 10.0 |
| Rasmussen Reports | September 25, 2008 | 54% | 41% | 13.0 |
| Rasmussen Reports | August 17, 2008 | 56% | 39% | 17.0 |
| Rasmussen Reports | July 9, 2008 | 51% | 45% | 6.0 |
| Southern Media/ Opinion Research | June 26-June 28, 2008 | 45.8% | 40.3% | 5.5 |
| Rasmussen Reports | May 28, 2008 | 47% | 44% | 3.0 |
| Mellman Group * | May 17-May 20, 2008 | 49% | 33% | 16.0 |
| Southern Media/ Opinion Research | March 26-April 9, 2008 | 50% | 38% | 12.0 |
| Survey USA | December 6-December 10, 2007 | 46% | 42% | 4.0 |
| Zogby International [ dead link ] | November 29, 2007 | 38% | 45% | 7.0 |
Question:
Which organization administered the poll that showed a lead margin of 5.5?
Answer:
Southern Media/ Opinion Research