Iran a great threat: Obama

US democratic presidential candidate Barack Obama says that Iran is a great threat and calls for tighter sanction.

U.S. Democratic presidential candidate Barack Obama on Wednesday said Iran is a "great threat" and called for tighter sanctions after it test-fired nine missiles.

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"Iran is a great threat. We have to make sure we are working with our allies to apply tightened pressure on Iran," the Illinois senator, who will face Republican John McCain in the November election, said on ABC's "Good Morning America."