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 | Sample Size | Margin of Error | Date | Democrat | Republican |
| --- | --- | --- | --- | --- | --- |
| Survey USA | 516.0 | 4.4 | Mar 14-16, 2008 | Hillary Clinton | John McCain |
| Survey USA | 516.0 | 4.4 | Mar 14-16, 2008 | Barack Obama | John McCain |
| Survey USA | 514.0 | 4.3 | Feb 15-17, 2008 | Hillary Clinton | John McCain |
| Survey USA | 514.0 | 4.4 | Feb 15-17, 2008 | Barack Obama | John McCain |
| Survey USA | 512.0 | 4.4 | Jan 16-17, 2008 | Hillary Clinton | Rudy Giuliani |
| Survey USA | 512.0 | 4.4 | Jan 16-17, 2008 | Hillary Clinton | Mike Huckabee |
| Survey USA | 512.0 | 4.4 | Jan 16-17, 2008 | Hillary Clinton | John McCain |
| Survey USA | 512.0 | 4.4 | Jan 16-17, 2008 | Hillary Clinton | Mitt Romney |
| Survey USA | 512.0 | 4.4 | Jan 16-17, 2008 | Barack Obama | Rudy Giuliani |
| Survey USA | 512.0 | 4.4 | Jan 16-17, 2008 | Barack Obama | Mike Huckabee |
| Survey USA | 512.0 | 4.4 | Jan 16-17, 2008 | Barack Obama | John McCain |
| Survey USA | 512.0 | 4.4 | Jan 16-17, 2008 | Barack Obama | Mitt Romney |
| Survey USA | 529.0 | 4.3 | Dec 21, 2007 | Hillary Clinton | Rudy Giuliani |
| Rasmussen Report | 529.0 | 4.3 | Dec 4, 2007 | Hillary Clinton | Rudy Giuliani |
| Rasmussen Report | 529.0 | 4.3 | Dec 4, 2007 | Hillary Clinton | John McCain |
| Survey USA | 542.0 | 4.3 | Nov 9-11, 2007 | Hillary Clinton | Rudy Giuliani |
| Survey USA | 542.0 | 4.3 | Nov 9-11, 2007 | Hillary Clinton | Mike Huckabee |
| Survey USA | 542.0 | 4.3 | Nov 9-11, 2007 | Hillary Clinton | John McCain |
| Survey USA | 542.0 | 4.3 | Nov 9-11, 2007 | Hillary Clinton | Mitt Romney |
| Survey USA | 542.0 | 4.3 | Nov 9-11, 2007 | Barack Obama | Rudy Giuliani |
| Survey USA | 542.0 | 4.3 | Nov 9-11, 2007 | Barack Obama | Mike Huckabee |
| Survey USA | 542.0 | 4.3 | Nov 9-11, 2007 | Barack Obama | John McCain |
| Survey USA | 542.0 | 4.3 | Nov 9-11, 2007 | Barack Obama | Mitt Romney |
| Survey USA | 533.0 | 4.3 | Oct 12-14, 2007 | Hillary Clinton | Rudy Giuliani |
| Survey USA | 521.0 | 4.4 | Oct 12-14, 2007 | Hillary Clinton | Mike Huckabee |
| Survey USA | 519.0 | 4.3 | Oct 12-14, 2007 | Hillary Clinton | John McCain |
| Survey USA | 516.0 | 4.4 | Oct 12-14, 2007 | Hillary Clinton | Ron Paul |
| Survey USA | 526.0 | 4.4 | Oct 12-14, 2007 | Hillary Clinton | Mitt Romney |
| Survey USA | 531.0 | 4.3 | Oct 12-14, 2007 | Hillary Clinton | Fred Thompson |
Question:
What was the sample size for the poll featuring Republican Ron Paul?
Answer:
516.0