If you clicked on my link, half way down the page you would note that the data came from the Guttmacher Institute 2001 study.  In a newer study they are they use 2.8%, which rounds to 3%.  My presumption was that one wouldn't interpret 1-3% as "quite often."  The assertion that abortion is "entirely their business" only works if you make the assumption that the child itself has no rights.  While Secretary Clinton has taken that position, it is this that I would challenge.  Keep in mind the Declaration of Independence declares "We hold these truths to be self-evident, that all men (read people) are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness."  Thus our disagreement may not be so much the source of our rights (presumably  God), but to whom these rights were given.  For those Catholics that accept the Church's teaching that life begins at conception, and so to do our rights.