state (class) vacator                    reason for change                 successor date of successors formal installation
0  new hampshire (2)  vacant  legislature failed to elect on time      john parker hale (r)                         july 30 , 1855
1        alabama (3)  vacant  legislature failed to elect on time  benjamin fitzpatrick (d)                     november 26 , 1855
2   pennsylvania (3)  vacant  legislature failed to elect on time        william bigler (d)                      january 14 , 1856
3     california (3)  vacant  legislature failed to elect on time        william m gwin (d)                      january 13 , 1857
4        indiana (3)  vacant  legislature failed to elect on time        graham n fitch (d)                      february 4 , 1857

Table as JSON:
{"state (class)":{"0":"new hampshire (2)","1":"alabama (3)","2":"pennsylvania (3)","3":"california (3)","4":"indiana (3)"},"vacator":{"0":"vacant","1":"vacant","2":"vacant","3":"vacant","4":"vacant"},"reason for change":{"0":"legislature failed to elect on time","1":"legislature failed to elect on time","2":"legislature failed to elect on time","3":"legislature failed to elect on time","4":"legislature failed to elect on time"},"successor":{"0":"john parker hale (r)","1":"benjamin fitzpatrick (d)","2":"william bigler (d)","3":"william m gwin (d)","4":"graham n fitch (d)"},"date of successors formal installation":{"0":"july 30 , 1855","1":"november 26 , 1855","2":"january 14 , 1856","3":"january 13 , 1857","4":"february 4 , 1857"}}