Cosponsorship occurs when a legislator adds her or his name to an official list of those who stand in support of a bill. According to Joint Rule 206 of the Maine State Legislature, “a bill, resolve, order, resolution or memorial may have up to 10 sponsors: one primary sponsor, one lead cosponsor from the other chamber and 8 cosponsors from either chamber. By mutual agreement the presiding officers may authorize additional cosponsors on a case-by-case basis.”