Mayor Kevin Johnson announced STAND UP; a new initiative launched on Monday. A $500,000 grant will kick-start the first phase of the new nonprofit's development. It will focus on raising academic achievement and college completion rates by advocating, supporting, and developing excellent public schools. The seed money comes from a national philanthropy group, the Eli and Edythe Broad Foundation.  Mayor Johnson said he's looking for a new education liaison; someone who will work with STAND UP. Rumors and speculation has Michelle Rhee, lightening rod Chancellor of Washington DC Public Schools as a leading candidate. Rhee a nimble leader, has played a major role in the Education Reform mo