Texas Gov. Rick Perry is all but certain to launch a presidential campaign and is nearing an announcement set for the second half of August, according to sources familiar with his political team's planning. For months, Republican activists, donors, elected officials, and even voters have dithered about their choices in the 2012 presidential primary contest. But they may have their man in Rick Perry, a telegenic and booming political presence who boasts executive experience as the nation's longest serving governor, as well as a healthy level of support from the tea party faithful. Two new national polls released on Friday...