Russert's guest, columnist Mike Barnicle, heaped praise and sympathy on Ted Kennedy for having borne so many family tragedies.
Mike Baricle was not invited by Russert. 
mnli hypothesis: Mike Baricle was not invited by Russert.  premise: Russert's guest, columnist Mike Barnicle, heaped praise and sympathy on Ted Kennedy for having borne so many family tragedies.