Why Senate Democrats Had To Invoke The ‘Nuclear Option’

# of Cloture Motions Filed
112th115
111th137
110th139
109th68
108th62
107th71
106th71
105th69
104th82
103rd80
102nd60
101st38
100th54
99th41
98th41
97th31
96th30
95th23
Sources: thinkprogress.org senate.gov