I agree with TJR.
As much as I hate the people who are texting, or constantly talking on the phone, unless they are involved in an accident there is really nothing we can or should do.
Even the simple acts of changing the channel on the radio, adjusting the volume, switching track or CD's, looking for your sun glasses, talking to your passenger, or yelling at the kids in the back seat...They are all distractions. Some people handle distractions better than others, and some can't handle any distractions.
I do not attempt to text anybody while driving, but if I receive a text message, I will read it as soon as it's safe to do so. If it's not any emergency, I don't worry about responding back until I am stopped or parked. If I need to reply immediately, (very, very rarely) I will pull over to reply.
My vehicles are equiped with BlueTooth hands free phone units so I can answer a phone call by just pushing a button, the volume on the radio is automatically muted, and my hands are still free to drive.
I realize that there are people who cannot talk and walk, much less talk and drive...but I don't think everyone should be assumed to be that unfocused...And we certainly don't need anymore laws that are subject only to the subjective opinion of a police officer.
...Rich