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Oil prices shot past $72 a barrel this week, and a growing number of experts point to Wall Street speculators as a key reason why Americans are suddenly paying a lot more for oil and gasoline.

most Capitol Hill lawmakers have remained silent about them, but not Sen. Susan Collins. The Maine Republican

Collins has been one of the few on Capitol Hill and even fewer Republicans who blame the rising oil prices in part on Wall Street investors. She and her allies, mostly Democrats, are trying to limit speculative investments in oil and other commodities,

On June 5, Deutsche Bank, a major global financial institution, echoed the warning that excessive speculation is behind rising oil and gasoline prices.

"Crude oil prices appear to have been divorced from the underlying fundamentals of weak demand, ample supply, and high inventories," commodity analysts at the bank wrote

She's one of only three Republican U.S. senators from the Northeast

a rare Republican

favors further

regulation of oil trading