The phrase "additional electoral" is correct and usable in written English.
It can be used in contexts discussing elections, voting processes, or political systems where extra or supplementary electoral measures or components are being referenced.
Example: "The committee proposed additional electoral reforms to enhance voter participation and transparency."
Alternatives: "supplementary electoral" or "extra electoral".
In 1888 additional electoral reforms for both houses were passed.
But even if a better field organization yielded Romney those 29 additional electoral votes, Obama still would have had a major win.
It is banking on holding all the states Senator John Kerry won in 2004 and picking up the additional electoral votes it needs by flipping some combination of Ohio, Nevada, New Mexico, Colorado, Indiana, Iowa and Virginia into the Democratic column.
As part of his continuing efforts to obtain anti-Catholic legislation, he attempted to create additional electoral districts in order to assure a large Protestant majority in the lower house of the Irish Parliament, but James I intervened (1614) and invalidated most of the scheme.
(And each state's at-large vote-winner receives two additional electoral votes, corresponding to the state's two U.S. senators).
Instead they are pushing states to adopt a system that is now in effect in Nebraska and Maine, where one electoral vote is awarded to the winner of each congressional district (and the state's at-large-vote winner receives two additional electoral votes, corresponding to the state's two senators).
An additional 51 electoral votes would be too close to call.
Similar action is needed from a collection of the other states totaling an additional 220 electoral votes.
So Ohio, which Mr. Kerry did not win in 2004, would go into Mrs. Clinton's column, giving her an additional 20 electoral votes.
Trump lost Minnesota and New Hampshire by a total of 47,492 votes, so a change of 23,747 votes would have given him an additional 14 electoral votes.
The upside to that Democratic strategy was that it gave Clinton a lot of different avenues to get the additional 16 electoral votes she would have needed to win the race.
