Is there any evidence of political advertising helping the country in any way? I've had limited exposure, but every one I've seen is either content free (smilin

Is there any evidence of political advertising helping the country in any way? I've had limited exposure, but every one I've seen is either content free (smiling face, vague promise), or sounds manipulative. Why not completely ban political advertising, requiring information on the parties to be released via their own website plus a master list. As well as equal airtime on news channels if coverage is actually that important to have. That'd also provide a slight chance of breaking this terrible 2 party system the US is stuck in, which seems to prevent any possibility of actual change.