Alaska Gov. Sarah Palin announces she's stepping down this month. Tom Foreman AC360° Correspondent Cue the orchestra; a tune like you might expect from Yanni if he were thrown from an airplane with his fingers duck taped to a keyboard. High above the center stage a spotlight blooms like a fuel-air bomb on a hair thin wire. The background glows muted, and Warholesque with mountain ranges, rivers, glaciers, frost-bitten miners, and pink salmon. The gaping maw of a Kodiak is pro