I'm just going by what my cousin said. It's just anecdotal evidence, of course. I am still puzzled as to why they called it so early, as it really wasn't a blowout there. That probably contributed to low GOP turnout in Colorado, Nevada and New Mexico.
Obama was ahead and the remaining areas were largely Democratic. His margin did indeed increase after it was called.
Highly doubt it had much effect on turnout, as people who would be apathetic enough to decide not to vote because of something like this would likely not have been knowledgeable enough to know that the loss of Ohio blocked McCain's last realistic chance of victory. These types of folks need to be told straight out that Obama has won, which didn't happen until the polls were closed on the West Coast.