This is interesting. The Chicago Tribune has a site to check on campaign contribitions to the 2007 Presidential Campaign.
I typed in "Doctor" under the Occupation field and got:
254 contributions totaling $255,011.71.
Then I typed in "Lawyer" in the Occupation field and got:
1,489 contribtions totaling $1,653,421.35.
So I wonder whose interests will be attended to first in the political health care debate?