Unfortunately this is not a trival task but we have a workaround for this type of situation.
You can create a dropdownfield that creates a statedropdown field and it to your widget template. In order to register the field for the users go to Administration->Users->Manage profile types(in the right sidebar)->Basic Profile and create new custom field for the basic profile. Leave the type "short text" in "Interface widget for entering data" select custom and in the textbox add the namespace to the custom widget ( Widgets.Selectors.TaxSelector.TaxonomyDropDownField ), save changes. The dropdown is added to the users module.
I have included a code sample for your reference.
<%@ Register TagPrefix="sf" Namespace="Widgets.Selectors.StateSelector" Assembly="Widgets.Selectors" %>
Please let me know if you have any additional questions.
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