Texas volunteers learn ropes at Camp Obama in Dallas 09:53 PM CDT on Sunday, October 5, 2008 By GROMER JEFFERS JR. / The Dallas Morning News gjeffers@dallasnews.com Unemployed and angry but with a strong sense of purpose, Shannon Curtis joined Barack Obama's volunteer army. Her first assignment: boot camp in Dallas, where the 27-year-old learned how to walk blocks, operate phone banks and become a precinct captain. She's being shipped with other Texans to one of the presidential battle's western fronts – the crucial swing state of Colorado. Ms. Curtis, who recently lost her job with a private equity firm,...