Zillow is essentially paying ad networks to pump-up downloads.

FORBES: Zillow IPO: From the Eyes of a Rival

Even Clear Channel is keeping Google on a tight leash, initially allowing the company access to less than 5% of its total ad inventory and drawing up what essentially amounts to a black list of existing advertisers that Google is prohibited from contacting.

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Notice the images of apple pie Americana that begin the ad, making the visual case that marriage is an essentially conservative institution that leads to societal stability and reduced dependence on the government.

CNN: How gay rights went mainstream

The two parties and their candidates are waging their ad war across a battlefield of about 17 states--a field that has essentially left out major media markets such as Los Angeles and New York.

CNN: latimes.com: Studies find political ad spending spree