That didn't work...  

Here is my SQL statement:

SELECT [Insurance Contacts Table].IC_InsuranceContactID, [Insurance Contacts
Table].IC_Contact, [Insurance Contacts Table].[IC_Insurance Company] FROM
[Insurance Contacts Table] WHERE ((([Insurance Contacts Table].[IC_Insurance
Company])=Forms![Job Work Order Form]![Insurance Company])) ORDER BY
[Insurance Contacts Table].IC_Contact;

Based on that site I tried entering the following into the above statement

UNION Select Null as AllChoice, "(All)" as Bogus From [Insurance Contacts
Table]

I tried it in two places: first before the ORDER BY and then before the
WHERE.  Eitehr way, my combo box had no selections when I clicked on it in
the form

This may be relevant.

The Combo Box (Insurance Company) that limits this Combo Box (Insurance
Contact) has this Event Code entered:

Private Sub Insurance_Company_AfterUpdate()
   Me.Insurance_Contact = Null
   Me.Insurance_Contact.Requery
   Me.Insurance_Contact = Me.Insurance_Contact.ItemData(0)
End Sub

Is there something I can add to this code to make the Insurance Contact
blank until I select it?