There are at least 2 things (emphasis added above) in your sentence that prevent abortion from being classified as "murder". People that define abortion as murder are merely redefining the word for shock value.
His "belief", from reading his stance(s) on the issue, is based on the the idea that life begins at conception. It's impossible, from the technical point of view of a doctor, to believe such nonsense. It's unreasonable to call a zygote, an embryo & so forth, a living human being. Essentially, he's arguing for "potentiality" (the possibility of this fertilization becoming a human being). There are too many problems with this argument to list but I'm hoping to avoid another abortion debate (we've been there & done that) so I'm not going to bother. I'm merely going to say that
"being potentially something isn't the same as being something already" & until he can prove that it is, he shouldn't hold such a strong point of view on the subject (her certainly shouldn't be calling it murder). I find it interesting how these people are always willing to err on the side of caution when it's something that they believe without reason (e.g: life beginning at conception) but are so unwilling to do so when there is reason (e.g: global warming).
I agree that he probably wouldn't appoint the next Henry Kissinger but I'm rather afraid of what he'd attempt to do domestically. Also, he wouldn't be the first politician to change his position or even lie.