Just a bit more info..
Since the founding of the Electoral College, there have been 156 faithless Electors. 71 of these votes were changed because the original candidate died before the day on which the Electoral College cast their votes. Three of the votes were not cast at all as three Electors chose to abstain from casting their Electoral vote for any candidate. The other 82 Electoral votes were changed on the personal initiative of the Elector.
82 electoral votes have been changed due to "personal initiative"
(from
http://www.fairvote.org/e_college/faithless.htm which seems to jive with more official general-sounding info)
something definitely interesting to ponder, at least to me.