A quick-and-dirty hack to have the Annotator (https://github.com/okfn/annotator) popup show the actually annotated text (!called "annotation.quote") in addition to the comment (!called "annotation.text").

annotation_quote.js

var data = $(element).data('annotator');
// expand the viewer to show the annotated text (quote)
data.viewer.fields[0].load = function (field, annotation) {
  return annotation.text
    ? $(field).html(annotation.quote + "<br/><i>" + escape(annotation.text) + "</i>")
    : $(field).html(annotation.quote),
    data.publish("annotationViewerTextField", [field, annotation]);
}