Give you a statement and table with its title in Markdown format, please determine whether the statement is supported or refuted by, or is unrelated to the table. It'a binary classification problem, you should choose the answer between supported and refuted. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| poll source | dates administered | democrat : tom harkin | republican : christopher reed | lead margin |
| survey usa | october 28 - october 29 , 2008 | 61% | 35% | 26 |
| rasmussen reports | october 23 , 2008 | 57% | 41% | 16 |
| rasmussen reports | september 25 , 2008 | 54% | 40% | 14 |
| survey usa | september 17 - september 18 , 2008 | 60% | 37% | 23 |
| des moines register / selzer & co | september 8 - september 10 , 2008 | 53% | 34% | 19 |
| rasmussen reports | august 7 , 2008 | 60% | 36% | 24 |
| rasmussen reports | july 10 , 2008 | 55% | 37% | 18 |
| rasmussen reports | june 10 , 2008 | 53% | 37% | 16 |
| research 2000 | april 21 - april 23 , 2008 | 59% | 20% | 39 |
Title:
none
Statement:
april 21 - april 23 , 2008 were the dates administered when the lead margin was less than 14 and the poll source was research 2000
Answer:
refuted