Next time you are watching a politician in a television interview, listen carefully to what questions are being asked and then evaluate whether they answered the question or not.
In many cases you'll find that they completely avoid the question and give an answer that reflects their party's policy.
I've seen the same thing happen in tender submissions. People are so keen to get "their" message across they don't pay enough attention to what is being asked. Rule number 1 is "always answer the question".
The challenge is to answer it in such a way that the purchaser gets what they want; but that you do it so that it positions your organisation as the one that can meet all the requirements better than anyone else.