A proposal by Senator Howard Cannon (D-NV) to the 91st Congress suggested a proportional electoral vote allocation plan. The number of electoral votes would be the same as before, but instead of popular electors choosing electors of the President, the popular vote would be used to divide the electoral vote of each jurisdiction calculated to three decimal places.
This is a much more radical proportional allocation plan than the one suggested by the diarist.
The key part of the proposed constitutional amendment was as follows.
http://www.every-vote-equal.com/sites/default/files/eve-4th-ed-ch3-web-v1.pdf