David Vitter joins Washington-based lobbying firm

BATON ROUGE - Former U.S. Sen. David Vitter won't stray from Washington for his next job, joining a well-known lobbying firm in the city.
    
Mercury LLC announced Thursday that Vitter has started working for the firm.
    
The Republican former senator said he'll be working both out of the Washington office and helping to establish a Gulf Coast operation. He says he'll continue to live in Metairie.
    
He expects