Black and White Theology

Are bumper stickers such as these effective in influencing legislators?  Are they designed to endear people, to change their opinion, or help shape the popular consensus?  Is it sending a message of love to all people, including those who have had to make this difficult decision?  Would they feel welcome at a church where this was the car parked beside the main entrance? Is it really this black and white?  These are some of the questions I ask myself on Sunday mornings.