> The graph shows that while both parties have always been distinct in their ideology, since about World War 1 there’s at least been some slight overlap. All that changed in the early 70’s though, as successive Republican congresses became increasingly more conservative in their voting records, while Democratic congresses remained much the same. Today, there’s no ideological overlap between members of the two parties.
[The rapidly increasing ideology of the US Republican Party](http://blog.revolutionanalytics.com/2012/10/the-rapidly-increasing-ideology-of-the-us-republican-party.html)
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