How Do I Know Who I Should Contact?

For US federal level policies, contact your United States Senator and Representatives. Representatives have offices in both DC and in local districts. Find your Member of Congress' phone number and put it in your contacts list. Call often. Even call to say "Thank you for voting in a particular way." It is great for them to hear when we agree with their votes too. In Massachusetts, your Senators are Senator Elizabeth Warren and Senator Edward Markey. For Massachusetts District 2 (see map below), your Representative is Congressman James McGovern. To find information on other MoC's in Massachusetts and in other states go to the following website:
United States Members of Congress

By 1: GIS (congressional districts, 2013) shapefile data was created by the United States Department of the Interior. 2: Data was rendered using ArcGIS® software by Esri. 3: File developed for use on Wikipedia and elsewhere by 7partparadigm. - GIS shapefile data created by the United States Department of the Interior, as part of the "1 Million Scale" geospatial data project. Retrieved from: http://nationalatlas.gov/atlasftp-1m.html?openChapters=#chpbound, Public Domain, https://commons.wikimedia.org/w/index.php?curid=32799307

By 1: GIS (congressional districts, 2013) shapefile data was created by the United States Department of the Interior. 2: Data was rendered using ArcGIS® software by Esri. 3: File developed for use on Wikipedia and elsewhere by 7partparadigm. - GIS shapefile data created by the United States Department of the Interior, as part of the "1 Million Scale" geospatial data project. Retrieved from: http://nationalatlas.gov/atlasftp-1m.html?openChapters=#chpbound, Public Domain, https://commons.wikimedia.org/w/index.php?curid=32799307

For State level policy, contact your MA State Senator or State Representative. These folks have offices in both Boston and in your local district. You can contact them in either location. Place their numbers in your contact list. To find current bills being considered for adoption in your state, go to the website OurStates. To find your Massachusetts Representatives, go to the following website.
Find your Massachusetts State Representatives

Governor Charlie Baker can be contacted for state policy. His contact information is as follows:

Springfield Office
Western Massachusetts Office of the Governor
State Office Building
436 Dwight Street Suite 300
Springfield, MA 01103
413-784-1200

Boston Office
Office of the Governor
Room 280
Boston, MA 02133
617-725-4005

Photo of Congressman McGovern via Visual Hunt.