This letter tells customers that you support a certain political figure. Be sure that you announce your support only if it will prove beneficial to the company (don't endorse a foaming-at-the-mouth racist, for instance).
1234, Main Street
Boston, MA 02123
<Recipient Address Goes Here>
We at Abc Company are proud to put our full support behind <candidate name> for the office of <open office>.
<candidate first name> has proven to be a person of integrity and commitment, and <important local issue> Abc Company proudly casts its vote for <candidate name>.and we hope you'll do the same. Thanks for your time.
encl: <List of enclosed items goes here>