The CEO of the Democratic National Committee is leaving after less than a year on the job, NBC News has learned. Veteran Democrat operative Jess O’Connell took the helm of the DNC last May with a mandate to help newly installed Chairman Tom Perez turn around a troubled party organization that was struggling after years of neglect and a brutal 2016 that included accusations of favoritism in the primary between Hillary Clinton and Bernie Sanders, the hacking of internal emails, and the loss to President Donald Trump. O’Connell will leave the party stabilized, if not yet fully recovered, after wins...