Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
2010 United States Senate Democratic primary election in Pennsylvania
Table title:
Results
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=2 rowspan=1 > Party </th><th colspan=1 rowspan=1 > Candidate </th><th colspan=1 rowspan=1 > Votes </th><th colspan=1 rowspan=1 > % </th></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Democratic </td><td class="highlighted"  colspan=1 rowspan=1 > Joe Sestak </td><td class="highlighted"  colspan=1 rowspan=1 > 568,563 </td><td class="highlighted"  colspan=1 rowspan=1 > 53.8 </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Democratic </td><td class="highlighted"  colspan=1 rowspan=1 > Arlen Specter (Incumbent) </td><td class="highlighted"  colspan=1 rowspan=1 > 487,217 </td><td class="highlighted"  colspan=1 rowspan=1 > 46.2 </td></tr>
<tr> <th colspan=3 rowspan=1 > Total votes </th><td colspan=1 rowspan=1 > 1,055,780 </td><td colspan=1 rowspan=1 > 100 </td></tr>
</table>
Question:
How many votes did Sestak win by in the 2010 United States Senate Democratic primary election in Pennsylvania?
Answer:
Sestak won with 53.8 percent of the vote, or 568,563 of the votes, compared to 46.2 percent and 487,217 votes for Specter.