sentences:  Bart Philemon, the Finance Minister challenged Somare's leadership of the National Alliance Party in 2007, but he was then dumped by the party and crossed over to the opposition.The only person who gained significant power dring this period was Somare's son Arthur, the Angoram Open MP and it became apparent that he was being groomed as the preferred successor.The second reason is Somare's refusal to have his authority challenged in parliament, even when there was no chance of dismissal of his government.