He knew.
"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." - Manuel II Palelologus
Just wait... By the end of the day the left will be claiming that McCain is the father...
That’s very respectable.
If he had eliminated her because of it, Bristol most likely would have felt like it was her fault. McCain was obviously thinking of the girl, and he knows his base pretty damn well.