[Solved] How can I pre-populate a lookup field in lightning:inputField?

Tad Asks: How can I pre-populate a lookup field in lightning:inputField?
I have been trying to pre-populate a lookup based lightning:inputField with a default value.

The code below renders a lookup field that works but I would like to be able to set a default contact in the field when it renders on the page. I have tried a lot of different ways to get this to go, but am at a loss. Any ideas?

Code:
<lightning:inputField fieldName="ContactId" aura:id="contactId"/>

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