Behind positive gains for shares of Salesforce.com Inc. and Visa, the Dow Jones Industrial Average is up Thursday morning. The Dow DJIA, -0.02% is trading 82 points, or 0.3%, higher, as shares of Salesforce.com Inc. CRM, +1.91% and Visa V, +2.20% have contributed to the index’s intraday rally. Salesforce.com Inc.’s shares have risen $4.41 (1.9%) while those of Visa have risen $3.81, or 1.9%, combining for an approximately 54-point bump for the Dow. Also contributing significantly to the gain are Amgen Inc. AMGN, -0.70%, Coca-Cola KO, +1.41%, and UnitedHealth UNH, -0.10%. A $1 move in any one of the 30 components of the Dow equates to a 6.58-point swing.