George Zimmerman, the Florida man accused of murdering 17-year-old Trayvon Martin, will be arraigned on Tuesday. In a courtroom just a few states north, the campaign finance trial of former Democratic Senator John Edwards continues in North Carolina – and his former mistress, Rielle Hunter, will likely testify this week. Facebook begins a marketing campaign to prove the company is worth their projected IPO, while Congress looks at limiting government support for banks.  Charlie Herman, business and economics editor for The Takeaway and WNYC and Callie Crossley, host of The Callie Crossley Show on WGBH, explore the stories for the week ahead.