<Mention Recipient’s Address Here>
Dear <Recipient’s Name>,
I very much understand how much work goes into a political campaign. Since I am planning to support <name> in <his/her> campaign for <office>, I thought it would be a good idea if I volunteered my services.
I have experience in <areas of experience>, and I can spare about <hours per week> a week for the campaign. If you would like to talk further or meet with me, please feel free to contact me a call at <phone number> or email me at <email id>.
Thank you very for your time and consideration. Would be looking forward to your response at the earliest.
Encl: <List of enclosed items goes here>