From the description:
And now for something completely different! If you stand for the right to life and have banged your head against the wall in a few too many online abortion debates… we hope this makes you smile!
If you’re a pro-choice moderate who keeps things civil, this video isn’t really about you. Please understand that we frequently encounter people who are actually pro-abortion, not pro-choice (see here for examples: http://bit.ly/1LGlIxm) and sometimes we just need to let off some steam.
And finally, if you don’t know the original song, you need to fix that. Here it is: https://www.youtube.com/watch?v=1y8aYd9uqFY