WHAT'S REALLY SCARING WALL ST...... fresh threats of higher taxes on the most productive......bank bailout mystery..........contradictory policy measures......vows to unclog the banking system of toxic mortgage debt, along with a mortgage "cram down" that would make that debt more toxic. Candidate Obama won over the street even as he was bashing the financiers who'd plunged the country into crisis b/c of bad bets on risky bonds. Sources say Jamie Dimon, JP Morgan, Lloyd Blankfein, Goldman Sachs, John Mack, Morgan Stanley and Dick Fuld, then of Lehman Bros were supporters, as were Larry Fink of money-management powerhouse BlackRock, and senior execs...