Honestly, unless you know how to write a press release, I advise against including one in a press kit. Find someone who does know how to write this specific type of document if you think you really need one. If you don't know the format and rules of the road for this PR tool it will work against you more than help in any way.
And god forbid you send a press release to a blogger! More on that subject later.
As the adage goes, when in doubt don't. Now is a very good time to follow that advice.