Arianna Huffington is guest-hosting Rachel Maddow's show on MSNBC tonight, and the lineup looks impressively ambitious: Google CEO Eric Schmidt, HBO talk-show host Bill Maher, stat-whiz Nate Silver and Cory Booker, the Newark mayor to whom the internet publisher was once rumored romantically linked (absurdly, her staff thought). The high-profile lefty gig is an appropriate laurel for an ambitious woman whose left-leaning site produced landmark coverage and gangbusters traffic amid the 2008 election. But as former Huffington Post staff can attest (and have), television appearances also mean a f...

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