I agree with the yard signs.
However buy several or put it close to your house.
One of the favorite opposition tactics in frustration is to steal yard signs.
Write your name and address on any yardsigns! It weighs heavily if the culprit is caught.
Get those bumper stickers on your cars, folks!
When you drive, you will interact with several hundred other people each hour. That type of exposure is priceless.
Besides, more bumper stickers demonstrates strong support and demoralizes the opposition.