No incumbent president this century has been so thoroughly outraised by a field of challengers in the year before a reelection contest. The main Republican challengers to President Barack Obama in 2012 barely took in more than the incumbent in 2011.

Meanwhile, President George W. Bush narrowly topped his challengers in fundraising in 2003, the year before he won reelection in 2004.

“The field is trouncing Trump in fundraising and that is unprecedented,” said Sarah Bryner, director of research and strategy at the Center for Responsive Politics.

The cash edge reflects a Democratic voter base energized and motivated since Trump’s 2016 election, Bryner said. She added that the pace of donations could reflect a dislike of Trump more than a fondness for any particular candidates — though Democratic contender and prolific fundraiser Sen. Bernie Sanders has a famously devoted following.