President Lyndon B. Johnson's only grandson will speak about civil rights during the Tejano Democrats' state convention Sunday at the Omni Bayfront Hotel Johnson's grandson, Lyndon Nugent, is the honorary chair of the "Take Back Texas" campaign, an effort to get more Democrats elected into office in Texas. He is an attorney in the San Antonio office of Akin, Gump, Strauss, Hauer & Feld, LLP. "Lyndon comes from a family with a deep commitment to civil rights and the Tejano community," Aaron Pena, chairman of the state Tejano Democrats, said in a prepared statement. "We, the children and grandchildren of...