Wheelchairs at the Tucson Tea Party?

The LW and I were passing Giffords' office recently during one of the Tea Party gatherings here in T-town and I was struck by the numbers of what appeared to be pretty healthy, fully ambulatory, white folks roughly the same age as my parents - you know, the last of the folks with pensions. What I noticed as missing were folks in wheelchairs, people with long term disabilities, etc. Where are they? It seems that the people with the closest contact with and dependence on the messed up aspects of the health care system that we have now, don't appear to be at these gatherings.