You would need to create a birthday list. Create the card, select that list. Populate the list with the person(s) to send it to. And send to that list. Then you would copy the campaign to use it over, and update the list as necessary. Now, personally, I would probably send it once a month to everyone in a birthday for the month -- but that's me.
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Check out this thread: http://community.constantcontact.com/forum/default.aspx?g=posts&t=1592 Or this one: http://community.constantcontact.com/forum/default.aspx?g=posts&t=2091
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