Shaff Plan

The Shaff Plan was a proposed amendment to the Iowa Constitution, proposed by state legislator David Shaff. The amendment would have called for the Iowa Senate to be apportioned by population, and the Iowa House of Representatives to be apportioned by area. In December 1963, in a public referendum, the amendment was rejected.

In February 1964, that state passed two reapportionment bills. They would later be declared unconstitutional, as they did not provide for "one man, one vote", as required in the US Supreme Court decision in Reynolds v. Sims (1964).