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:
Bob Casey Jr.
Table title:
Electoral history
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><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 > Robert P. Casey, Jr. (inc.) </td><td colspan=1 rowspan=1 > 3,021,364 </td><td class="highlighted"  colspan=1 rowspan=1 > 53.7% </td><td colspan=1 rowspan=1 > −4.9% </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Republican </td><td class="highlighted"  colspan=1 rowspan=1 > Tom Smith </td><td colspan=1 rowspan=1 > 2,509,114 </td><td class="highlighted"  colspan=1 rowspan=1 > 44.6% </td><td colspan=1 rowspan=1 > +3.3% </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Libertarian </td><td colspan=1 rowspan=1 > Rayburn Smith </td><td colspan=1 rowspan=1 > 96,926 </td><td colspan=1 rowspan=1 > 1.7% </td><td colspan=1 rowspan=1 > +1.7% </td></tr>
<tr> <th colspan=3 rowspan=1 > Majority </th><td colspan=1 rowspan=1 > 512,250 </td><td colspan=1 rowspan=1 > 9.1% </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <th colspan=3 rowspan=1 > Turnout </th><td colspan=1 rowspan=1 > 5,627,404 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=2 rowspan=1 > Democratic hold </td><th colspan=1 rowspan=1 > Swing </th><td colspan=1 rowspan=1 > −4.9% </td><td colspan=1 rowspan=1 >  </td></tr>
</table>
Question:
Who did Bob Casey Jr. defeat and what were their respective vote percentages?
Answer:
Bob Casey Jr. defeated Smith, 53.7% to 44.6%.