Politico: It's a familiar Washington ritual. Captains of industry, hands in the air, swearing to tell the whole truth and nothing but it, sit before angry members of Congress for a public flogging about their alleged misdeeds. Now it's Big Oil's turn. Massachusetts Democrat Ed Markey, one of the top environmentalists in Congress, has called the top executives from BP, ExxonMobil, Chevron, ConocoPhillips and Shell to testify before his subcommittee next Tuesday - the first time the executives will have testified together before the committee in nearly three years.