U.S. stocks opened lower Tuesday after a Russian jet is downed on the Turkey-Syrian border. Investors are worried about fresh global geopolitical tensions after Turkey shot down a jet fighter claimed by Russia near the Syrian border. Upscale jeweler Tiffany's (TIF) reported a surprise drop in quarterly sales as a strong dollar hurt tourist spending in the United States and reduced the value of sales from other markets. Campbell Soup's (CPB) fiscal first-quarter adjusted profit easily topped analysts' estimates and it increased its full-year earnings forecast, citing an improved margin outlook for the year. Campbell's like many food companies is adjusting its products to a changing consumer who is demanding more organic and natural options.