The difference is the methodology employed, F + M uses 41% dems, 35% Repubs and 21% Indes. This poll was formerly known as the “Keystone Poll.”
Well then it is still:
Concerned if McCain Elected President
Yes
16% - GOP
72% -Dems
47% -Independents
.16 (.35) + .72 (.41) + .47 (.21)= .056 +.2952 +.0987= .4499= rounding up, about 45% are concerned about McCain becoming president
Concerned if Obama Elected President
Yes
82% -GOP
39% -Dems
60% -Independents
.35 (.82) + .41 (.39) + .21(.6) = .287 + .1599 + .126= .5729= rounding down, 57% concerned about Obama becoming president
I think the 12+% gap is still pretty significant