DES MOINES, Iowa — Four years ago, the Beaverdale neighborhood in Des Moines organized big for President Barack Obama’s re-election, building an uber-volunteer group skilled at phone-banking, door-knocking and boosting caucus and general election participation. The volunteers dubbed their leafy neighborhood Obamadale.

Now the 2016 Democratic presidential hopefuls are visiting this liberal stronghold, trying to rename it once more.

Former Maryland Gov. Martin O’Malley hung out at a local bar Friday night and Hillary Rodham Clinton was set to visit a house party Saturday afternoon. But they may have to keep wooing for a while. The neighbors are split among the candidates or undecided.

“I think Obamadale is still kind of an open target for candidates at this point,” said Brad Anderson, a resident who served as Obama’s state director in 2012.

Anderson said that in the last presidential election, the Obamadale group “over-performed by every metric that was set.” The group of about 20 core activists and dozens more participants got training from the campaign and put in long hours working the phones and going door to door. They turned out big numbers on caucus night and again in the November general election, when the incumbent Obama won the state. Their organizing methods were so successful that they were sent to other areas to boost participation.