Sounding off here is far from enough. Writing letters asking someone to vote for or against a Bill is better. Writing a check is great for those who can, but so is volunteering to help on the campaign. That will be remembered.
Every campaign needs help. If you have never volunteered before you might be surprised at how much help they can use. It might be walking an area to put out door hangers or it might be knocking and talking to people. If you have the ability, it might be sitting in a campaign office and making telephone calls urging people to vote for your candidate. It could also be just helping by moving paper or sorting materials. It could be manning a booth at an event. It could be distributing yard signs. When I was a young one, living in a rural area, I distributed yard signs and literature via horseback.