WASHINGTON (Reuters) – U.S. President-elect Barack Obama's top choice to lead the U.S. Department of Homeland Security is Arizona Gov. Janet Napolitano, CNN reported on Wednesday, citing multiple sources. The Democratic governor, a supporter and campaigner for Obama's presidential campaign, had been reported to be on a short list of people to fill cabinet posts in the new administration. CNN also reported that Chicago businesswoman Penny Pritzker was Obama's pick for commerce secretary.