Senate Party Composition by Electoral Votes, 1962-2014.

[retromike22]

This is a chart I made that shows the Senate composition of all the states based on their electoral votes. Basically, for a given year at the beginning of a Congress I see which states have their two seats controlled by two Democrats, two Republicans, or have split control. I assign third party or Independent Senators based on which party they caucused with. I then enter those seats into our good ol' fashioned electoral calculator. I don't split Maine and Nebraska, and I remove D.C..  For simplicity I count the parties' positions at the beginning of a Congress, so some special election Senators will not show up.

For reapportionment, I change the map that I used to count the electoral votes every 10 years, specifically between the 0' year and the 2' year. (Example between 1990 and 1992, 2000 and 2002, etc). So the 112th Congress, which was elected in 2010, would use the 2000 reapportionment, (as would the years 2002-2010). But the 113th Congress, which was elected in 2012, would use the 2010 reapportionment, (as would the years 2012-2020).

To check for an error, you would find the Senate composition at the beginning of a specific Congress and enter it into the election calculator based on the map I used in the description above.

If there are any errors, please let me know.

[Southern Senator North Carolina Yankee]

You can clearly see the effect of D-Amato losing in 1998. The Republicans actually broke even EC wise but NY going from split to Dem gave them a big boost.

[retromike22]

Some facts:

1. Since 1962, the Republicans have led the EV once, in 2004.

2. Since 1962, the Democrats have had a higher EV than the Republicans with the exception of the following years: 1982, 1996, 1998, and 2004.

3. The "Split" Composition led the EV from 1972 to 1998, a 26 year period.

4. The Democrats led the EV from 2000 to 2014, with the exception of 2004.