If the independents are swinging to Bush by double digit, you'd have to assume either:
1) Bush is losing a lot more Republicans than Kerry is losing Democrats. That I don't believe for a second.
or
2) There are a hell of a lot more Democrats in this poll than Republicans. I pick door #2.
No way to really know
If we ballpark Republicans at 90% / 5% for Bush
and
If we ballpark Democrats at 85% / 10% for Kerry
then
This would imply a party ID breakout of
Dems 39%
GOP 32%
Indy 29%
+/- a huge magin of error 
Hey... it's one more poll
My figures agree with yours.
This approaches a CBS or LA Times poll for loading.
