Nice try. I will side with the Pope and my conscience that tells me that more than 40 million murdered unborn babies is enough.
Incidentally, do you have any statistics to support your point that a Catholic voter who supported a pro-abortion candidate actually went through this pain-staking thought process in deciding whom to vote for? You sound like you are giving them an excuse.
However, to my literal shock and sorrow, I have run into such people. There is no way I would justify their pro-Obama vote; in fact, I contested hotly with them.
In 3 cases, I got them to change their minds. Amazingly.
But I did learn something: that some people have ways of thinking that would blow your mind.