Is Using An IUD The Same As Abortion?

As I was driving the other day, I was listening to a Sisriux FM channel, and they were covering a hearing from the Louisiana House of reps, where a legislator was arguing that an IUD is akin to murdering a child, and wanted it added to the list of things a woman would be accused of (murder), if she chose an IUD.

His argument was that an IUD works by preventing a fertilized egg from sticking to the uterus wall, therefore it's killing a baby, because a sperm fertilized an egg and the IUD aborts it.

I thought I was in the Twilight Zone. A Democrat legislator was trying to argue that this makes no sense....