The issue of illegal immigration took center stage in Meg Whitman’s campaign yesterday after the Republican’s former housekeeper made allegations at a news conference that the gubernatorial candidate “abused” her. Whitman’s former housekeeper of nine years, Nicky Diaz-Santillan, says Whitman “exploited, disrespected, humiliated and emotionally and financially abused” her.  Diaz was fired in June 2009. […]