Wouldn't that give us the number of electoral votes for each candidate?
Not necessarily. Many voters split their ticket, so they vote, say, Republican for President, but vote for a Democrat for Congress, or they vote Democrat for President then vote for a Specter-type Republican for the House. You'd have to get the breakdown of each district's Presidential vote.
Of course, it ould be intersting to show us how each CD voted for President as opposed to how it voted for Congress.
Happened in Texas during this last election. District 17 went strongly for President Bush but sent a hardcore liberal to the House.