TFRs are just another security theater from post 9/11 era: a typical VIP movement TFR radius is 3-4NM and a big enough plane to carry a real weapon or to be a weapon by itself (e.g. business jet with speeds above 400 knots) will penetrate through TFR in less than a minute which is obviously not enough time to intercept such a plane.<p>In the same time, TFRs are hurting aviation business. Quite a few Bay Area flight instructors recently joked that they will vote for Republicans next time since Obama is visiting Bay Area too often and there are too many TFRs.