Huh?
Worship the Lord thy God and Him only shalt thou serve.
The point is that supporting Santorum will split the vote and deliver the nomination to Romney.
Therefore, the only God is the Trinitarian God of classic, historic Christianity.
While that might not matter to you, it should have mattered to an evangelical, bible-based Christian as Dobson claims to be.
If he can overlook Jesus ruling on the planet Kolob, and Jesus’ father here, and his father some other planet, and his father someplace else and his father some other planet, ad infinitum, then you get a picture of what Dobson is ignoring.