Yeah, I think we want Germany to win. If we lose to or draw Portugal, we'd be sitting at 3-4 points, or 1 W (+ 1 T), and we'd be wanting Ghana (presumably at 0) to beat Portugal and send us through. Would not want to be in a must win position against Germany...
But a lot can happen with ties and whatnot, so we'll see how the dust settles after Sunday. Would be especially interesting if Ghana manages to tie or beat Germany.
In summary, it's far better if Germany runs away with the group since the US, with one already, is a strong contender for 2nd place. If Germany gets thrown into the mix with everyone else tomorrow, it becomes a hairier proposition for us.