Combine tomatoes and next 8 ingredients (through pepper) in large glass bowl. Remove 1/4 cup mixture to small bowl for garnish; reserve. Add bread to large bowl and toss; cover and refrigerate 1 hour or overnight.
Using an immersion blender (or a standard blender, working in batches), blend until smooth; thin with up to 1/2 cup water to desired consistency. Divide among 4 bowls and top with reserved garnish.