Abstract
This paper explores the relationship between the partisan division of the northern vote in U.S. House elections and the partisan division of northern House seats. From at least 1952 through 1964, there was a noticeable pro-Republican bias to northern districting, in the sense that the Republicans consistently won about ten per cent more of the seats than the Democrats could obtain from the same percentage of the vote. Following the 1964 election, this partisan inequity has disappeared, but the evidence suggests that this change is only temporary. The normal pattern of a Republican advantage in northern House elections is produced by a Republican gerrymander of accidental origins: the tendency of Democratic voters to cluster in heavily Democratic areas where their votes for Congress go “wasted.” Neither malapportionment nor deliberate partisan gerrymandering appears to have played a major role in distorting the outcomes of House elections.

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