Story highlights Hillary Clinton remains atop the Democratic presidential primary field, a new poll shows

The Monmouth University poll also found that the economy is the top issue for primary voters

Washington (CNN) Hillary Clinton is holding steady atop the Democratic field nationwide and the economy still tops Democratic voter concerns, according to a Monmouth University poll released Wednesday.

Clinton tops Bernie Sanders 59%-26% nationwide, and former Maryland Gov. Martin O'Malley has 4% support. The results are largely unchanged from Monmouth's last national survey of Democrats, released in October.

"Clinton successfully ran the gauntlet this fall, appearing before the Benghazi Committee and outlasting the specter of a Biden candidacy. She really hasn't lost ground since then," Patrick Murray, director of the Independent Monmouth University Polling Institute, said in a statement Wednesday.

The results mirror a CNN/ORC poll released earlier this month which found Clinton beating Sanders 58%-30%.

The Monmouth survey also found that Democrats are still largely concerned with the economy, even after the Paris and San Bernardino terrorist attacks -- 27% said they were most concerned about the economy and jobs, while 20% said national security and terrorism is their main concern.