Well, I don't know what happened. I rewired up the Robot to get that snarl of wires out of the way and now the motors don't work with the motor shield and the servo used with the Ping sensor jitters.
Here are things I've tried:
I've tried rewiring the motors to the breadboard a few different ways to no avail because I thought it was the poor soldering job I did on the wires and the wires I made were not seated in the breadboard properly. I made new solid core wires with no effect.
If I put power and ground from the breadboard to the motors, they work fine.