bragging rights I suppose.

In obama's case, bragging rights from a big name in the rock & Roll pantheon which is in itself a category overwhelmingly white and male..

So it makes a slight impact, if only symbolically.

Just as I said Richardson's endorsement doesn't translate into suddenly getting some mythic Hispanic bloc vote. It merely shows people that a big name in the establishment thinks you've got a better shot than the other guy/gal. It's more a reassurance to undecideds, when coupled with other factors, can help to sway someone.

In and of itself, it means little to nothing.