Then the "no impact" message is repeated again at the end with "Allowing loving, committed couples to get married isn't going to change our relationship one bit; we're voting Yes on 1." It's also significant (and effective) that it is the husband in the couple who delivers the no impact line, since almost always, men are more opposed to marriage equality than women.
And so the ad basically summarizes a basic truth at the core of the ballot measure fights: marriage equality only impacts the people who would be able to get married. The heterosexual supremacists have to try and scare and confuse voters that somehow allowing gay people to get married is going to have some detrimental impact on children, on society, on marriage itself. But these claims are not based on facts or evidence but are appeals to simple homophobia, discrimination and ignorance. This ad rejects these appeals and re-affirms the basic principle at stake of "live and let live." I would have liked to see an inclusion of the golden rule in the ad, but it's corollary is in there and is also effective.