Won't leave a message, and hang up when I answer the phone.

Same thing, as soon as you say anything they hang up.  I get this repeatedly.

A robo call from Concerned Veterans for America.org inviting me to participate in a town hall meeting to discuss current events and the impact on veterans.

Concerned Veterans for America robo call for a town hall style meeting. The meeting was conducted in a manner to fulfill the "politcal party' part of the DO NOT CALL Registry. However, if you sit and listen, they are concerned vets for america provided you follow a republican way of thinking. The call was also a weak attempt to get people to join their organization. The entire conversation was nothing but a slam on President Obama and Democratic policies. Don't waste your time hitting *3 (to ask a question of the panel). If your question doesn't follow their views, you will be left in the queue until the call is over.