From time to time, the American Astronomical Society, as part of its policy activities, joins letters to policymakers written by peer organizations or collectively as part of a coalition.1
The AAS is currently a member organization with the Task Force on American Innovation (TFAI), the Energy Sciences Coalition (ESC), the Coalition for National Science Funding (CNSF), the Physical Sciences Education Policy Coalition (PSEPC), and the U.S. Coalition for the Advancement of Supercomputing (USCAS).
Recent sign-on letters via TFAI can be found here, and include letters urging an end to sequestration during negotiations over the Bipartisan Budget Act of 2013, closing the "Innovation Deficit," and prioritizing research and development in the FY 2014 and 2015 appropriations.
Recent sign-on letters via the CNSF include ones on the importance of the merit-review process to effective funding of research at the National Science Foundation and expressing the coalition's concerns about the Frontiers in Research, Science, Technology (FIRST) Act of 2014.
The most recent sign-on letter via ESC was regarding negotiations over the FY 2014 appropriations and expressed the coalition's support for the Department of Energy Office of Science.
There are no recent letters from PSEPC, as this coalition was just founded in March 2014.
In November 2013, the AAS joined a statement led by the National Center for Science Education supporting accurate science education and opposing efforts to weaken or remove evolution from science textbooks.