Pedzisa mashoko anotevera: Muna 2008, Díaz akava purezidhendi weU.S. Conference of Mayors. Somunhu akazvimirira, uye aimbova Democrat akanyoreswa, Diaz akataura pa2008 Democratic National Convention ndokutsigira
Kuedza kwaObama kuva purezidhendi. Kutevera kusarudzwa kwaObama, Diaz akafungidzirwa kuti ave munyori weHHS; nzvimbo yacho yaizopedzisira yaenda kuna Kathleen Sebelius.