Does my contactlist in a campaign update with contacts ?

Does my contactlist in a campaign update with contacts ?

I've made a campaign (selection of contacts) in crm, ready to sync with Constant Contact.  I question now if my campaign contactlist will be updated if I add new contacts in the crm contacts ?  So, if I add a new contact (in contacts), is the contact added in the campaign list automatically (if the new contact falls into the selection that I defined in the campaign set-up) ?  Hope it does... ?