Wall Street dips as spiking crude prices revive fears of inflation, rate hike

(Updates to mid-afternoon trading)
* Indexes down: Dow 0.57%, S&P 500 0.36%, Nasdaq 0.31%
* Warsh's hawkish stance puts upcoming data in focus
* LIkelihood of September rate hike increases
* Nvidia, chipmakers gain
By Stephen Culp and Niket
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