Uber seeks a second-in-command to steady the wheel

Uber on Tuesday began searching for a second-in-command to help embattled chief executive Travis Kalanick steady the wheel at the fast-growing on-demand ride service.Analysts say Uber's rocky past month -- marred by disclosures about a culture of sexism and its covert use of law enforcement-evading software -- underscores the need for more mature management at the world's most valuable venture-backed startup.Kalanick, known for being brash and aggressive in propelling Uber's rise, also poses pot