Yes, he does have a point. He made a damaging statement in two parts: talking about "legitimate rape" which would infuriate the MSM and the left in general, and talking about the idiotic notion that the body is less susceptible to pregnancy after a rape.
The first part is a valid point, and the second part is nonsense.
Can the Missouri GOP unilaterally decide to dump him from the ticket, or is the only option for him to resign?