I doubt that Obama would cause much of a concern in the D/FW area. Reagan used to come there all the time. I always knew when he was in town or even when he was coming to town because the Secret Service always knocked a friend of mine out of his parking place in downtown Dallas.

Bush used to come to Dallas a lot and even lives there now. He also shows up in Austin where he serves as an Usher when he attend church there.

Except for their motorcades you would never know they were there. The place is just too big.

Now when Bush came to his ranch outside of Waco that did screw up the town. Traffic was shut down for miles and the entire city would be tied up.