From left, mayoral candidates Andy Shallal, Muriel Bowser, Jack Evans, Chris Carter, and Mayor Vincent Gray. (Marvin Joseph/The Washington Post)

In four weeks, tens of thousands of District voters will choose a Democratic nominee for mayor among eight candidates on the ballot. If you plan on being one of them, now’s the time to be educate yourself for April 1.

In recent weeks, Washington Post reporters have reported a series of stories on incumbent Vincent C. Gray’s record on economic development, public safety and homelessness, with more installments to come, as well as profiles and video features on five of his leading challengers: Andy Shallal, Tommy Wells, Jack Evans, Vincent Orange and Muriel Bowser.

Now we’ve put together an interactive guide to the Democratic candidates’ stances on key city issues, including various aspects of education, development, housing, ethics, crime and more. Aaron C. Davis and I compiled the guide from the candidate’s voting records and public statements. If there’s a subject we haven’t covered, send an e-mail or tweet, and we’ll do our best to add it to the list.

The winner of the April 1 Democratic primary will face the unopposed nominees from the Statehood Green and Libertarian parties, as well as any independent candidates who qualify for the ballot, in the Nov. 4 general election.