The four candidates for the presidency of the governing Liberal Democratic Party each appeared positive Saturday about the possibility of revising the war-renouncing Article 9 of Japan's Constitution.

Speaking on a morning TV show, Prime Minister Junichiro Koizumi, who is seeking re-election as LDP leader in the Sept. 20 party poll, and the three challengers said Article 9 should be amended because it is too vague.

They agreed it "should be revised in the future."