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:
1940 United States presidential election in Oklahoma
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 > Franklin D. Roosevelt (inc.) </td><td colspan=1 rowspan=1 > 474,313 </td><td class="highlighted"  colspan=1 rowspan=1 > 57.41% </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Republican </td><td class="highlighted"  colspan=1 rowspan=1 > Wendell Willkie </td><td colspan=1 rowspan=1 > 348,872 </td><td class="highlighted"  colspan=1 rowspan=1 > 42.23% </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Prohibition </td><td colspan=1 rowspan=1 > Roger Babson </td><td colspan=1 rowspan=1 > 3,027 </td><td colspan=1 rowspan=1 > 0.37% </td></tr>
<tr> <th colspan=3 rowspan=1 > Total votes </th><td colspan=1 rowspan=1 > 826,212 </td><td colspan=1 rowspan=1 > 100% </td></tr>
</table>
Question:
Who won Oklahoma in the 1940 presidential election and by how much?
Answer:
Oklahoma was won by incumbent President Franklin D. Roosevelt, with 57.41% of the votes, against Wendell Willkie, with 42.23% of the votes.