More than 1,000 Houston dropouts woke up Saturday morning to an unexpected knock on their door from some of the city's top dignitaries — including Mayor Annise Parker, Houson ISD Superintendent Terry Grier and Democratic gubernatorial candidate Bill White — encouraging them to return to school. Hundreds of volunteers made morning house calls as part of the Houston Independent School District's seventh annual dropout recovery walk, now called Grads Within Reach. The walk, born in Houston in 2004, has expanded to 22 Texas school districts, as well as St. Louis and Des Moines, Iowa. "Our success as a city depends...