After adding new contacts to my list, how do I resend an old old campaign to them but not everyone else that was on the list earlier?

After adding new contacts to my list, how do I resend an old old campaign to them but not everyone else that was on the list earlier?

After adding new contacts to my list, how do I resend an old old campaign to them but not everyone else that was on the list earlier?

For example, this morning i sent out a campaign.  Later today I found some new email addresses and added them to that same contact list.  Now I want to send out the same campaign to those new people only...

??