Reply #1: Because the corporate owned media denounces the ads that

[SharonAnn]

are aired against Republicans. They are denounced loudly, widely, and repeatedly in all the corporate owned media so that public hears, over and over again, that not only are the ads false but that they are sponsored by the despicable Democratic hate party.

On the other hand, if a smear ad against Democrats is aired, the corporate owned media replay it for free on the "news" shows and then have "balanced" discussions about it that, at best, lean towards the "well we don't know if it's true or not but there is certainly food for thought in this ad." At worst, the corporate owned media shows the ads and talks about them as if they're true with headlines and sound bites like "Veterans who served with Kerry tell the REAL STORY".