In my experience, folks I knew/know with congestive heart failure do not cough like hillary does.
I can speak with authority on the subject having been diagnosed with such two years ago. I fought all the symptoms for months, up all night coughing but not like her dry cough. Finally went to the doctor. While undergoing an angiogram I died on the table. Course they brought me back but my edema was such (swollen ankles) that I was up about forty pounds.
The cure? Lots of meds but the lifesaver is the water pill. Drains congestion and eliminates edema. Dropped fifty pounds in two months....all water. You can manage CHF very well but frequent trips to the pissoir is a bit of a bother