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Wall Street jumps on revised Bear deal

Dow's gain may signal market's worst is over

The blue-chip index jumps 187 points, and tech stocks soar. JPMorgan boosts its Bear Stearns offer to $10 a share. Some traders say the gains show the market has bottomed. Existing-home sales are better than expected. The Justice Department backs XM's merger with Sirius

JPMorgan raises Bear Stearns bid to $10/share