overlapping bars on "dodge" ggplot histogram - can it be fixed?

Hadley,

Thank you again for your suggestion.

I am going with the second solution.  It appears to have a consistent bar
width and helps to illustrate when data is not present within a certain
bin.

One other silly question - how in the world do I get the x-axis label to
"not" show up?  I want the x-label, but not the x-axis to appear, e.g. for
the example below the not to see the "Rural Feamale", "Rural Male", ... that
are on the lower x-axis?