As partisan polarization has increased, split-ticket voting has declined precipitously

The decline in a measure of split-ticket voting. Explanation below.

Last month, Steve Singiser noted the paucity of congressional seats won by a presidential candidate of one party but held by a member of the opposite party following the elections of 2014 in his post, “Is split-ticket voting dying?” As Steve relates, the consequences of this change are more detrimental to Democrats than Republicans, especially in state legislatures.
In the graph above, we can see this decline in split-ticket voting for US Representatives clearly plotted. In 2000, a Republican running for the House received a vote share that was nearly nine points off (median) from what George Bush had in that same district; by 2012, that number had fallen to a little more than three points off from the vote share of Mitt Romney.

Join me below the fold to see graphs of these results.  

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