Democratic Party deputy leader Renho announced Friday she will run for the position of party president on Sept. 15, vowing to reform the nation's largest opposition force into a credible alternative.

Speaking at a news conference, Renho, who is among the nation's most high-profile female politicians, said the party should be able not only to criticize the government but also to propose alternative policies.

"This may be a mere presidential election of one party . . . but I'm determined to make this the starting point (for voters) to change the government," said Renho, 48.