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Romney set to clinch nomination, general election attacks narrow

Mitt Romney is set to clinch the GOP nomination tonight and officially become the Republican nominee. MSNBC’s Alex Wagner and the NOW panel – Politico’s Glenn Thrush, the Chicago Sun-Times’ Lynn Sweet,’s Steve Kornacki, and the Boston Globe’s Scott Helman – discuss the end of the primary season, and the attacks between Romney and the President as the general election season officially begins.