This letter informs citizens that you are setting up a petition for a certain cause and that you need volunteers.
1234, Main Street
Boston, MA 02123
05 April, 2005
<Recipient Address Goes Here>
The issue of <issue> is one that affects nearly all of us. That is why <source of petition> <is/am/are> planning to circulate a petition in the coming weeks to gather signatures in support of <cause>. <I/We> hope to obtain <number> signatures and then present the petition to <government body>.
However, <I/we> can't accomplish this goal alone. Volunteers are needed to take the petitions to the people and gather signatures. This will take only a few hours per week, and will very for a very worthwhile cause. If you are interested in volunteering and would like more information, please contact <contact person> at <phone number>.
encl: <List of enclosed items goes here>