Democratic frontrunner denounces McCain "smear" against him over Hamas.
Tells CNN the Arizonan's claim that Hamas wants Obama to win is "offensive" and "disappointing." Click above.
"For him to toss out comments like that I think is an example of him losing his bearings as he pursues this nomination."
Tackles several other topics in wide-ranging interview to air on "The Situation Room," beginning at 4 pm ET.
