The Pre-existing Condition Swing Vote?

I saw this Obama ad today—and being a man with a heart condition and defined as having a pre-existing condition—I was moved by it.
So, that got me thinking… how many people are there with pre-existing conditions in the USA?
I googled it and came up with 57.2 Million.
131.3 million people voted in 2008.
People with pre-existing conditions make up 43.6% of the electorate (assuming of course we are all old enough to vote).
That means an elected official, protecting the rights of people with pre-existing conditions against a candidate who wishes to discriminate against people with pre-existing conditions, would only need to get 8.45 million people without pre-existing conditions--or 7.4% of the electorate-- to vote for them if all of us with pre-existing conditions voted for them.
That’s one hell of a swing vote!
Just sayin’.