top of the hour. chances of the downgrade after the supercommittee failure. and a great excuse to pour yourself an extra cup of coffee. mark preston, live for us at washington, d.c., the home of the cnn debate tonight. the republican and constitution hall in the heart of washington, d.c., we are just steps away from the white house. these candidates are focusing on trying to sell themselves on a very, very key issue. that is national security. an issue that has not really been discussed a whole lot, brooke, so far in this campaign n addition to that, they are going to talk about the economy which has been said by some military folks as the number one national security facing the economy is the american economy and being able to turn it around. it will be interesting to turn it around. we have some candidates on the rise, such as newt gingrich, and some on the decline, such as rick perry, and of course all of them in the middle trying to vie for support as we head right in