If so, check the flexible rubber steering column couplings first. If these appear to be in good shape, check the lower mounting bracket for cracks. It's loated below the dash where the column passes through the firewall. You may have to move the flexible hose going to the defroster duct in order to see it.
Cracks usually appear along the top edges where the U-bolt passes through the bracket.
Probably using the steering wheel for support when entering or exiting the car. This puts a lot of stress on the bracket, which is made of very thin metal to begin with. If you've determined that the bracket is, in fact, broken, you can now decide how to go about fixing it. If dealing with a show car, the bracket need only be welded or brazed back together to remain stock. No way are you going to weld or braze anything under the dash without burning wiring and hoses and putting spatter burns in your rugs.