Toledo Blade: Calling it one of the most dangerous weapons pointed at America, presumptive Democratic nominee Barack Obama yesterday vowed to break the hold the “tyranny of oil” has on the United States. “Tyrants from Caracas to Tehran use [oil] to prop up their regimes, intimidate the international communities, hold us hostage to a market that is subject to their whims,” he said. “You know, if Iran decided to shut down the petroleum-rich Strait of Hormuz tomorrow, they believe oil …