Brazil prosecutors seek U.S. help in Petrobras probe

• Brazil prosecutors investigating the Petrobras (NYSE:PBR) corruption scandal say they are asking U.S. authorities for help in building their case.
• The federal prosecutor's office says it was "inspired by the FIFA case," in which the U.S. has brought charges against some of the world soccer organization's top figures.
• The scandal continues to wear down poll numbers for Brazilian Pres. Rousseff, whose approval rating has dropped to a new low 10% of respondents who said the Rousseff administration was "excellent or good."