user
Instruction
Answer the question based on the provided table.


Table
Table Title: Opinion polling by state for the United States presidential election, 2008 (Iowa)
Table Content:
| Poll Source | Sample Size | Margin of Error | Date | Democrat | % | Republican | % |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Rasmussen Reports | 500 | 4.5 | Mar 31, 2008 | Hillary Clinton | 36 | John McCain | 51 |
| Rasmussen Reports | 500 | 4.5 | Mar 31, 2008 | Barack Obama | 46 | John McCain | 42 |
| Survey USA | 517 | 4.4 | Mar 14-16, 2008 | Hillary Clinton | 44 | John McCain | 48 |
| Survey USA | 517 | 4.4 | Mar 14-16, 2008 | Barack Obama | 50 | John McCain | 44 |
| Rasmussen Reports | 500 |  | Feb 18, 2008 | Hillary Clinton | 37 | John McCain | 47 |
| Rasmussen Reports | 500 |  | Feb 18, 2008 | Barack Obama | 44 | John McCain | 41 |
| Survey USA | 563 | 4.2 | Feb 15-17, 2008 | Hillary Clinton | 41 | John McCain | 52 |
| Survey USA | 563 | 4.2 | Feb 15-17, 2008 | Barack Obama | 51 | John McCain | 41 |
| Survey USA | 543 | 4.3 | Jan 4-6, 2008 | Hillary Clinton | 51 | Rudy Giuliani | 35 |
| Survey USA | 543 | 4.3 | Jan 4-6, 2008 | Hillary Clinton | 47 | Mike Huckabee | 45 |
| Survey USA | 543 | 4.3 | Jan 4-6, 2008 | Hillary Clinton | 44 | John McCain | 48 |
| Survey USA | 543 | 4.3 | Jan 4-6, 2008 | Hillary Clinton | 48 | Mitt Romney | 40 |
| Survey USA | 543 | 4.3 | Jan 4-6, 2008 | Barack Obama | 66 | Rudy Giuliani | 26 |
| Survey USA | 543 | 4.3 | Jan 4-6, 2008 | Barack Obama | 58 | Mike Huckabee | 35 |
| Survey USA | 543 | 4.3 | Jan 4-6, 2008 | Barack Obama | 55 | John McCain | 38 |
| Survey USA | 543 | 4.3 | Jan 4-6, 2008 | Barack Obama | 59 | Mitt Romney | 33 |
| Survey USA |  |  | Dec. 17, 2007 | Hillary Clinton | 46 | Mike Huckabee | 45 |
| Survey USA | 546 | 4.3 | Nov 9-11, 2007 | Hillary Clinton | 47 | Rudy Giuliani | 43 |
| Survey USA | 546 | 4.3 | Nov 9-11, 2007 | Hillary Clinton | 49 | Mike Huckabee | 43 |
| Survey USA | 546 | 4.3 | Nov 9-11, 2007 | Hillary Clinton | 44 | John McCain | 48 |
| Survey USA | 546 | 4.3 | Nov 9-11, 2007 | Hillary Clinton | 49 | Mitt Romney | 43 |
| Survey USA | 546 | 4.3 | Nov 9-11, 2007 | Barack Obama | 52 | Rudy Giuliani | 39 |
| Survey USA | 546 | 4.3 | Nov 9-11, 2007 | Barack Obama | 56 | Mike Huckabee | 35 |
| Survey USA | 546 | 4.3 | Nov 9-11, 2007 | Barack Obama | 50 | John McCain | 42 |
| Survey USA | 546 | 4.3 | Nov 9-11, 2007 | Barack Obama | 53 | Mitt Romney | 39 |
| Survey USA | 513 | 4.4 | Oct 12-14, 2007 | Hillary Clinton | 48 | Rudy Giuliani | 43 |
| Survey USA | 506 | 4.3 | Oct 12-14, 2007 | Hillary Clinton | 51 | Mike Huckabee | 41 |
| Survey USA | 502 | 4.5 | Oct 12-14, 2007 | Hillary Clinton | 49 | John McCain | 44 |
| Survey USA | 498 | 4.5 | Oct 12-14, 2007 | Hillary Clinton | 52 | Ron Paul | 36 |
| Survey USA | 506 | 4.4 | Oct 12-14, 2007 | Hillary Clinton | 50 | Mitt Romney | 42 |
| Survey USA | 509 | 4.4 | Oct 12-14, 2007 | Hillary Clinton | 50 | Fred Thompson | 42 |


Question
how many times was 4.3 listed as the margin of error?


Answer Format
The final answer should be concise and use the following format:
```json
{
    "answer": [
        "answer1",
        "answer2",
        ...
    ]
}
```
rule
["17"]