Michael Barone considers the 2010 congressional seat reapportionment

and finds that the states that Bush won in 2004 gain 8 House seats:

Which is to say that, under the new electoral vote distribution, Bush's 286-to-252 electoral vote margin in 2004 becomes 294-to-244. Bush would have lost in 2004 if Ohio had not gone his way; under the projected post-2010 apportionment, Bush would have won 276-to-262 if Ohio had not gone his way. The demographic trends reflected in these projections would not prevent Barack Obama from being elected this year and re-elected in 2012, but they would make it marginally more difficult. Demography, modestly, favors the Republicans, and more than modestly over the long haul.