Actually ... you're both right. There was, indeed, an extended campaign by the KofC to add "under god"; but it was largely unsuccessful. Furthermore, it was articulated in a context of anti-communism and a resistance to atheism, which was seen as linked to communism.
It wasn't until Eisenhower was persuaded *by someone else* (i.e., not the KofC) that a Republican senator introduced legislation to alter the pledge. It was (a) knowledge of Eisenhower's support of such legislation and (b) the general anti-communist political context that enabled the legislation. The KofC played a role; but they aren't directly responsible.
Trust me. I'm a doctor.
PS, I hope I don't regret posting in this thread....