While in the Assembly, Hancock sat on the Assembly Committee on Rules and chaired the Subcommittee on Sexual Harassment and Violence Prevention, and was a member of the Committee on Education, the Committee on Housing and Community Development, the Budget Committee and the Budget Subcommittee on Health and Human Services.
In 2005, Hancock authored AB 144, which provided financing for the construction of the new eastern span of the San Francisco-Oakland Bay Bridge.