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:
92nd United States Congress
Table title:
Senate
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > State (class) </th><th colspan=1 rowspan=1 > Vacator </th><th colspan=1 rowspan=1 > Reason for change </th><th colspan=1 rowspan=1 > Successor </th><th colspan=1 rowspan=1 > Date of successor's formal installation </th></tr>
<tr> <td colspan=1 rowspan=1 > Georgia (2) </td><td class="highlighted"  colspan=1 rowspan=1 > Richard Russell Jr. (D) </td><td class="highlighted"  colspan=1 rowspan=1 > Died January 21, 1971 </td><td class="highlighted"  colspan=1 rowspan=1 > David H. Gambrell (D) </td><td class="highlighted"  colspan=1 rowspan=1 > February 1, 1971 </td></tr>
<tr> <td colspan=1 rowspan=1 > Vermont (1) </td><td colspan=1 rowspan=1 > Winston L. Prouty (R) </td><td colspan=1 rowspan=1 > Died September 10, 1971 </td><td colspan=1 rowspan=1 > Robert Stafford (R) </td><td colspan=1 rowspan=1 > September 16, 1971 </td></tr>
<tr> <td colspan=1 rowspan=1 > Louisiana (2) </td><td colspan=1 rowspan=1 > Allen J. Ellender (D) </td><td colspan=1 rowspan=1 > Died July 27, 1972 </td><td colspan=1 rowspan=1 > Elaine S. Edwards (D) </td><td colspan=1 rowspan=1 > August 1, 1972 </td></tr>
<tr> <td colspan=1 rowspan=1 > Georgia (2) </td><td class="highlighted"  colspan=1 rowspan=1 > David H. Gambrell (D) </td><td class="highlighted"  colspan=1 rowspan=1 > Successor elected November 7, 1972 </td><td class="highlighted"  colspan=1 rowspan=1 > Sam Nunn (D) </td><td class="highlighted"  colspan=1 rowspan=1 > November 7, 1972 </td></tr>
<tr> <td colspan=1 rowspan=1 > Louisiana (2) </td><td colspan=1 rowspan=1 > Elaine S. Edwards (D) </td><td colspan=1 rowspan=1 > Successor elected November 13, 1972 </td><td colspan=1 rowspan=1 > Bennett Johnston Jr. (D) </td><td colspan=1 rowspan=1 > November 14, 1972 </td></tr>
</table>
Question:
How is Richard B. Russell Jr. (D) succeeded?
Answer:
Richard B. Russell Jr. (D) died on January 21, 1971 and was later succeeded by David H. Gambrell (D) on February 1, 1971.