Obama appears to be assembling a team that includes a mix of longtime aides, Washington insiders and a sprinkling of Democratic governors. Besides Napolitano, strong contenders for Cabinet posts include New Mexico Gov. Bill Richardson and Kansas Gov. Kathleen Sebelius.

Sebelius and Napolitano, who once was Arizona's attorney general, were among the first governors to commit to Obama's candidacy. Richardson endorsed Obama after ending his own presidential bid, angering the Clintons.

As governor, Napolitano has fought to curb illegal immigration, but she has been skeptical that building a fence along the border will solve the problem. She once said, "You build a 50-foot wall, somebody will find a 51-foot ladder."

Last year, her state passed a law that requires all Arizona businesses to use the federal online database, E-Verify, to confirm that new hires have valid Social Security numbers and are eligible for employment. This has been a cornerstone of the Bush administration's immigration policy.

As governor, she has overseen wildfires and severe flooding and worked with the Federal Emergency Management Agency, now part of the Homeland Security Department.