Washington : Two leading Republican presidential candidates Rick Santorum and Newt Gingrich are training their guns on President Barack Obama as they woo conservative voters ahead of contests for party nomination.

Campaigning in the perennial swing state of Ohio, former senator Santorum said the president’s “radical environmentalist policies” are helping push gas prices to near record highs and are threatening to derail the economic recovery.

Obama’s “mismanagement” of US foreign policy in the Middle East as the cause of “tension” reflected in rising oil prices, Santorum, who has won four of the nine contests to date, said.

Former House speaker Gingrich, meanwhile, told a Tulsa, Oklahoma, event that Obama was “incapable of defending the United States” and therefore defeating him in the November election was a “duty of national security.”

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