state (class)                   vacator                    reason for change                  successor date of successors formal installation
0     arkansas (2)      john l mcclellan (d)              died november 28 , 1977  kaneaster hodges , jr (d)                     december 10 , 1977
1      montana (2)           lee metcalf (d)               died january 12 , 1978        paul g hatfield (d)                      january 22 , 1978
2    minnesota (1)     hubert humphrey (dfl)               died january 13 , 1978        muriel humphrey (d)                      january 25 , 1978
3      alabama (3)           james allen (d)                   died june 1 , 1978   maryon pittman allen (d)                          june 8 , 1978
4      alabama (3)  maryon pittman allen (d)  successor elected november 7 , 1978         donald stewart (d)                      november 7 , 1978
5    minnesota (1)     muriel humphrey (dfl)  successor elected november 7 , 1978      david durenberger (r)                      november 8 , 1978
6       kansas (2)       james b pearson (r)          resigned december 23 , 1978        nancy kassebaum (r)                     december 23 , 1978
7  mississippi (2)        james eastland (d)          resigned december 27 , 1978           thad cochran (r)                     december 27 , 1978
8    minnesota (2)    wendell anderson (dfl)          resigned december 29 , 1978         rudy boschwitz (r)                     december 30 , 1978
9      wyoming (2)       clifford hansen (r)          resigned december 31 , 1978         alan k simpson (r)                       january 1 , 1979

Table as JSON:
{"state (class)":{"0":"arkansas (2)","1":"montana (2)","2":"minnesota (1)","3":"alabama (3)","4":"alabama (3)","5":"minnesota (1)","6":"kansas (2)","7":"mississippi (2)","8":"minnesota (2)","9":"wyoming (2)"},"vacator":{"0":"john l mcclellan (d)","1":"lee metcalf (d)","2":"hubert humphrey (dfl)","3":"james allen (d)","4":"maryon pittman allen (d)","5":"muriel humphrey (dfl)","6":"james b pearson (r)","7":"james eastland (d)","8":"wendell anderson (dfl)","9":"clifford hansen (r)"},"reason for change":{"0":"died november 28 , 1977","1":"died january 12 , 1978","2":"died january 13 , 1978","3":"died june 1 , 1978","4":"successor elected november 7 , 1978","5":"successor elected november 7 , 1978","6":"resigned december 23 , 1978","7":"resigned december 27 , 1978","8":"resigned december 29 , 1978","9":"resigned december 31 , 1978"},"successor":{"0":"kaneaster hodges , jr (d)","1":"paul g hatfield (d)","2":"muriel humphrey (d)","3":"maryon pittman allen (d)","4":"donald stewart (d)","5":"david durenberger (r)","6":"nancy kassebaum (r)","7":"thad cochran (r)","8":"rudy boschwitz (r)","9":"alan k simpson (r)"},"date of successors formal installation":{"0":"december 10 , 1977","1":"january 22 , 1978","2":"january 25 , 1978","3":"june 8 , 1978","4":"november 7 , 1978","5":"november 8 , 1978","6":"december 23 , 1978","7":"december 27 , 1978","8":"december 30 , 1978","9":"january 1 , 1979"}}