You can search for responses you've already tagged by doing the following:

1) Go to the Feedback Tab in your Admin Dashboard

2) Type the name of the tag whose associated responses you are looking for in the search bar in the top right corner.  (in the  screenshot we used the tag 'marketing')

3) All of the responses that have been tagged with 'marketing' will appear

In the screenshot below, you'll see that 522 total responses have been tagged with 'marketing'.  This represents 88% of the total responses.  In this case, all 522 responses are promoter scores of 9 or 10, and have been idenfied as such. Detractors and Passives have zero responses that have been tagged with the 'marketing' tag.