Definitely the spacing should be handled by margin-top and margin-bottom. For example:
p.interview {
margin-top:0.5em;
margin-bottom:0.5em;
text-indent:0em;
text-align:justify;
}
In the text, <p class="interview">
If half a line isn't enough at beginning and end of the interview, you could create a interviewfirst class for the first para, with a 1 em top and bottom margin. Subsequent paragraphs would be 0 top and 1 em bottom.