VIEWER'S GUIDE: About silver linings, soft spots, hard math

Democratic presidential candidate Sen. Bernie Sanders, I-Vt., greets supporters during a campaign rally at Milton High School in Milton, Mass., Monday, Feb. 29, 2016. (AP Photo/Jacquelyn Martin)WASHINGTON (AP) — A quarter of Americans get their say in the presidential nominating races on Super Tuesday, sounding off with a giant megaphone.

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