Poll: People believe Bush behind SBVT

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According to Annenberg (I think) 46% think Bush is behind the ads and 37% think they're independent.

Which brings me to my question on a lot of these types of polls: are they just a break down along party lines with a little noise? Wouldn't it be more interesting to just know what undecided voters thought? Exclude people who are hardcore Bush (and would believe SBVT if they had Yasser Arafat as a spokesperson) or hardcore Kerry who would never believe them. These numbers are interesting, but hard to make really good sense out of.