"A series of six graphs titled ""Polarization of the U.S. Congress"". The x-axis of each graph is labeled ""most liberal -1"" on the left and ""most conservative +1"" on the right, and divided vertically by a line in the center labeled ""0"". The y-axis of each graph starts at 0 and ends at 85. The first three graphs are labeled ""Senate"" and arranged horizontally. The left-most graph is titled ""93rd Congress, 1973-74"" and shows a majority of democratic senators around "".4"" and a majority of republican senators around "".3"" on the x-axis. A few democrats are shown at ""0"", "".1"", and "".2"", and a few republicans are shown at ""0"", ""-.1"", ""-.2"", and ""-.3"". The middle graph is titled ""103rd Congress, 1992-94"" and shows a majority of democrats around ""-.2"", and a majority of republicans around "".3"". A few democrats are shown at ""0"" and "".1"", and a few republicans are shown at ""0"", and ""-.1"". The right-most graph is titled ""112th Congress, 2011-12"" and shows a majority of democrats around ""-.3"", and a majority of republicans around "".4"". There is no overlap across the line labeled ""0"". The second three graphs are labeled ""House"" and arranged horizontally. The left-most graph is titled ""93rd Congress, 1973-74"" and shows a majority of democratic senators around "".4"" and a majority of republican senators around "".3"" on the x-axis. A few democrats are shown at ""0"", "".1"", and "".2"", and a few republicans are shown at ""0"", ""-.1"", and ""-.2"". The middle graph is titled ""103rd Congress, 1992-94"" and shows a majority of democrats around ""-.35"", and a majority of republicans around "".4"". A few democrats are shown at ""0"" and "".1"", and a few republicans are shown at ""0"", and ""-.1"". The right-most graph is titled ""112th Congress, 2011-12"" and shows a majority of democrats around ""-.4"", and a majority of republicans around "".7"". There is no overlap across the line labeled ""0"". A source at the bottom of the graphs reads: ""Pew Research Center. Chart sources: Royce Carroll, Jeff Lewis, James Lo, Nolan McCarty, Keith Poole and Howard Rosenthal, voteview.com. June 12, 2014.""."