I love the idea but let's focus on those who have actually donated money to Hewitt. The WA PDC has a searchable database and this is the shortened url to Mike's 2012 race donors:
The list includes lots of people who probably care what you think including:
Progressive Insurance, Allstate Insurance, Anheuser Busch, Hood river Distillery, Seattle Mariners, Enterprise Rent a car, Kroger, Public School employees Union, BECU, Washington Teamsters.
Peruse the list and find your own favorites. If you click on the far left column it includes some contact info. Be respectful but I'm sure that companies like Progressive Insurance would like to know that Mike Hewitt isn't so progressive.