Remember Martin O'Malley? He's polling Democrats in Iowa about 2020.

Former Maryland Gov. Martin O'Malley might not have made it terribly far in the Democratic primary against Hillary Clinton and Sen. Bernie Sanders, but he's already testing the waters for 2020, Politico reports.

O'Malley's leadership PAC commissioned a Public Policy Polling survey to feel out where caucus-goers in Iowa stand when considering a field of nine potential Democratic candidates. O'Malley led with 18 percent, followed by New Jersey Sen. Cory Booker, who had 17 percent, and Minnesota Sen. Amy Klobuchar, who had 11 percent.

Former Housing Secretary Julian Castro, New York Gov. Andrew Cuomo, New York Sen. Kirsten Gillibrand, California Sen. Kamala Harris, Facebook COO Sheryl Sandberg, and Starbucks CEO Howard Schultz were also included in the poll, but each received less than 10 percent. Curiously, some major potential 2020 competitors were left out of the poll, including Massachusetts Sen. Elizabeth Warren, Ohio Sen. Sherrod Brown, and Sanders, Politico points out.

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The overwhelming opinion, though, is one of indecision: "Not sure" got 32 percent of the vote.

O'Malley said in January that he "just might" run in 2020. He dropped out of the 2016 race after earning less than one percent in Iowa last February.