President Obama’s choice of James Comey to head the FBI has been welcomed by two groups representing key elements of the bureau’s workforce. The FBI Agents Association had previously backed a former special agent—House Intelligence Committee Chairman Mike Rogers, R-Mich.—for the job. But in a Friday statement issued shortly after Obama formally nominated Comey,  the association’s president, Konrad Motyka, said the former Justice Department official has an “outstanding reputation” among agents. “We believe that Mr. Comey understands the centrality of the special agent to the bureau’s mission of protecting our country from criminal and terrorist threats,” Motyka said. “We look forward…