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They are advertising, they are agitprop.
Wait, so you have nothing against lying to sell your product? No problems with tobacco companies saying smoking cures cancer? But it's advertising!
They are the staple of all elections.
If you are a Republican and think "He did it too" is a legitimate means of establishing something's morality.
Stop being childish for God's sake or whatever molten deity you bow to.
So to call lying wrong is being childish? Not doing too much good for your cause here.
I know, let's put a banner on the bottom of all TV ads that show a candidate shaking hands. And the banner must read "Professional Politician, closed course, do not attempt"
Or we could just subject politicians and their mouthpieces to the same basic scrutiny that we would use on people in real life. Sources that lie to us in day to day life are discredited, and I don't see why we should make an exception just because some of those sources are Republican.