state (class)                  vacator                                  reason for change                successor date of successors formal installation
0         missouri (3)                   vacant   did not take seat until after congress commenced      waldo p johnson (d)                        march 17 , 1861
1           kansas (2)                   vacant               election not recognized by us senate         james h lane (r)                         april 4 , 1861
2           kansas (3)                   vacant               election not recognized by us senate     samuel c pomeroy (r)                         april 4 , 1861
3   north carolina (2)         thomas bragg (d)   withdrew march 6 , 1861 , expelled later in 1861        vacant thereafter                      vacant thereafter
4            texas (1)      louis t wigfall (d)                           withdrew march 23 , 1861                   vacant           vacant for remainder of term
5   north carolina (3)    thomas l clingman (d)  withdrew march 28 , 1861 , expelled later in 1861        vacant thereafter                      vacant thereafter
6         illinois (2)    stephen a douglas (d)        died june 3 , 1861. successor was appointed   orville h browning (r)                         june 26 , 1861
7            texas (2)        john hemphill (d)                               expelled july , 1861                   vacant           vacant for remainder of term
8         arkansas (2)  william k sebastian (d)                            expelled july 11 , 1861  expelled july 11 , 1861                      vacant thereafter
9         arkansas (3)    charles b mitchel (d)                            expelled july 11 , 1861  expelled july 11 , 1861                      vacant thereafter
10        michigan (2)    kinsley s bingham (r)       died october 5 , 1861. successor was elected       jacob m howard (r)                      january 17 , 1862
11       tennessee (1)       andrew johnson (d)                            resigned march 4 , 1862        vacant thereafter                      vacant thereafter
12    rhode island (1)      james f simmons (r)   resigned august 15 , 1862. successor was elected      samuel g arnold (r)                      december 1 , 1862
13      new jersey (1)       john r thomson (d)  died september 12 , 1862. successor was appointed      richard s field (r)                     november 21 , 1862

Table as JSON:
{"state (class)":{"0":"missouri (3)","1":"kansas (2)","2":"kansas (3)","3":"north carolina (2)","4":"texas (1)","5":"north carolina (3)","6":"illinois (2)","7":"texas (2)","8":"arkansas (2)","9":"arkansas (3)","10":"michigan (2)","11":"tennessee (1)","12":"rhode island (1)","13":"new jersey (1)"},"vacator":{"0":"vacant","1":"vacant","2":"vacant","3":"thomas bragg (d)","4":"louis t wigfall (d)","5":"thomas l clingman (d)","6":"stephen a douglas (d)","7":"john hemphill (d)","8":"william k sebastian (d)","9":"charles b mitchel (d)","10":"kinsley s bingham (r)","11":"andrew johnson (d)","12":"james f simmons (r)","13":"john r thomson (d)"},"reason for change":{"0":"did not take seat until after congress commenced","1":"election not recognized by us senate","2":"election not recognized by us senate","3":"withdrew march 6 , 1861 , expelled later in 1861","4":"withdrew march 23 , 1861","5":"withdrew march 28 , 1861 , expelled later in 1861","6":"died june 3 , 1861. successor was appointed","7":"expelled july , 1861","8":"expelled july 11 , 1861","9":"expelled july 11 , 1861","10":"died october 5 , 1861. successor was elected","11":"resigned march 4 , 1862","12":"resigned august 15 , 1862. successor was elected","13":"died september 12 , 1862. successor was appointed"},"successor":{"0":"waldo p johnson (d)","1":"james h lane (r)","2":"samuel c pomeroy (r)","3":"vacant thereafter","4":"vacant","5":"vacant thereafter","6":"orville h browning (r)","7":"vacant","8":"expelled july 11 , 1861","9":"expelled july 11 , 1861","10":"jacob m howard (r)","11":"vacant thereafter","12":"samuel g arnold (r)","13":"richard s field (r)"},"date of successors formal installation":{"0":"march 17 , 1861","1":"april 4 , 1861","2":"april 4 , 1861","3":"vacant thereafter","4":"vacant for remainder of term","5":"vacant thereafter","6":"june 26 , 1861","7":"vacant for remainder of term","8":"vacant thereafter","9":"vacant thereafter","10":"january 17 , 1862","11":"vacant thereafter","12":"december 1 , 1862","13":"november 21 , 1862"}}