Why is the Republican majority greater in the US House of Reps than in the Senate?

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The Politicus
Feb 14, 2016 02:46 AM 0 Answers
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Currently, Republicans control both houses of the US Congress. What's surprising to me is that their majority is greater in the House of Representatives (57%) than in the Senate (54%). I think that historically the opposite has been true, due to the general trend that most of the less populous states have more conservative voters, and the Senate gives equal representation to these small, conservative states.

Republican share of US Congress, 1991-2015

In the chart above, you can see Republicans being much stronger in the Senate after the 2010 midterm elections, but never before (in recent history).

Is there any new systemic reason that the House of Representatives is more Republican than the Senate? Or is this simply due to a statistical anomaly in the Senate (where just a few races can swing the majority)? Or is the cause of this discrepancy just the fact that Senate terms are longer and therefore its makeup changes more slowly than the House of Reps? Or did gerrymandering after the 2010 census give Republicans an edge in the House of Reps?

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  • February 14, 2016