[Find our original post and some senate race suggestions HERE.]
Here are some websites that can help you identify downticket races to get involved in. (Working for a candidate you believe in is worthwhile in any state or district, but here's a list of states in which additional voter turnout will be especially impactful: AZ, GA, IA, OH, NV, CO, FL, WI, MI, PA, NH, VA, NC)
Cook Political Report's List of Close House Races
Progressive Democrats of America (PDA) - List of Endorsed Candidates
Real ClearPolitics' Close Senate Races
Real Clear Politics' Close Gubernatorial Races