Democratic Arizona Gov. Janet Napolitano smiles during a press availability in her office at the state capitol Wednesday, June 4, 2008, in Phoenix. Democratic rising stars, Arizona Gov. Napolitano and Kansas Gov. Kathleen Sebelius, have been mentioned as two potential running mates who could help Barack Obama woo female voters. (AP Photo/Ross D. Franklin)

Democratic Arizona Gov. Janet Napolitano smiles during a press availability in her office at the state capitol Wednesday, June 4, 2008, in Phoenix. Democratic rising stars, Arizona Gov. Napolitano and Kansas Gov. Kathleen Sebelius, have been mentioned as two potential running mates who could help Barack Obama woo female voters. (AP Photo/Ross D. Franklin)

This Jan. 30, 2008, file photo shows Democratic Arizona Gov. Janet Napolitano, left, clapping for Democratic presidential hopeful Sen. Barack Obama, D-Ill., as he holds a "Stand for Change" rally at Veterans Memorial Coliseum Wednesday, Jan. 30, 2008, in Phoenix. Democratic rising stars, Arizona Gov. Napolitano and Kansas Gov. Kathleen Sebelius, have been mentioned as two potential running mates who could help Barack Obama woo female voters. (Photo/Ross D. Franklin, file)

Arizona Gov. Janet Napolitano looks on during the National Governors Association winter meetings on Saturday, Feb. 23, 2008, in Washington. (AP Photo/Evan Vucci)

Janet Napolitano