That is, a witness's credibility cannot be bolstered, only impeached. Their ranks have since been bolstered by recent immigration, especially from Morocco and Algeria. Tilden further bolstered his presidential candidacy through a nationwide newspaper advertising campaign. Instead, CAP strength was bolstered as much as possible. Instead, the raid bolstered American morale. Upon their arrival, the two men bolstered the administration's claims of success. In response to repeated raids, defenses were bolstered throughout the island during the 16th century. In addition, the rise of Deaf community organizations bolstered the continued use of ASL. Their positions were also bolstered by thousands of Cuban troops. Democratic National Convention bolstered Barkley's candidacy. Social media has also bolstered the sports media scene. American troops and weapons soon bolstered KMT forces, allowing them to reclaim cities. Democratic strength in New Hampshire was also bolstered by Jackson's landslide re-election that year. Jalal, empowered by the now bolstered ranks of the Taliban, flatly refuses. On July 14, 2010, the Nuggets bolstered their frontcourt depth by signing Al Harrington.