The bid/asked spread for Pennsylvania is 48.0 bid 51.7 asked; the mean is 49.85, so that state should be recorded as leaning to John Kerry, and the projected electoral vote totals change to 283 for Bush, and 255 for Kerry.
I only use the mean of the bid and ask prices if the last price is 50.0.
In the case that the mean of the bid and ask prices is also 50.0, then the tie goes to John Kerry due to voter fraud.