[header] How to write a letter to your united states senator [title] Identify why you are writing your senator. [step] There are many reasons why you might contact your senator. However, most people write because they want to share their opinion on something. 
For example, many constituents write their representatives for the following reasons : [substeps] You want them to vote yes or no on a bill under consideration in the senate. You want them to introduce a bill or hold hearings on a topic.