Wednesday Headlines: 

• One Nation support plateaus in new poll
• Search for missing baby boy in South Australia continues today
• Human casualties confirmed after magnitude 7.1 earthquake hits Japan
• Ben Carroll calls for Royal Commission as Opposition criticises his integrity
• 3.6 million people track Qantas flight to France

Deep Dive: Jacinta Allan has stepped down from the Victorian Labor leadership after less than three years in the role. 

With an election just four months away, how does her decision affect the party's chances of winning? And can Labor get back on top in Victoria? 

In this episode of The Briefing, Channel 7's Political Editor, Mark Riley joins Sacha Barbour Gatt to explain. 

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