Millions of small dollar donors forked over just shy of half a billion dollars to Democratic candidates up and down the ballot in the first half of the year, a sign that enthusiasm and engagement among the party’s core backers remains at record levels.

More than 3.3 million donors have given candidates and liberal groups $420 million over the first six months of the year through the ActBlue fundraising platform, the group said in a blog post Wednesday. In the last three months, 2.4 million individual donors gave $246 million.

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ActBlue said 390,000 donors made contributions on June 30, the last day before the fundraising quarter ended, a number higher than on any other day in the platform’s history.

The amount those donors have given through the beginning of the cycle is nearly twice what they gave over the same period of time in the 2018 cycle, when Democratic candidates raised record sums en route to winning back control of the House.

“Building off the unprecedented participation of the 2018 midterms, small-dollar donors have expanded this grassroots movement in incredible ways,” Emily Dong and Zoe Howard wrote on ActBlue’s blog.

Democrats have been concerned about maintaining the high levels of voter enthusiasm that fueled their wins in the 2018 midterm elections. But voters on both sides of the aisle have indicated they are even more enthusiastic about voting now than they had been in the days and weeks leading up to recent presidential elections.

An SSRS survey conducted for CNN in April found 70 percent of voters were either extremely or very enthusiastic about voting in the presidential election. Just before the 2016 election, only 47 percent of voters were extremely or very enthusiastic; before the 2012 contest, 68 percent said the same.

Those numbers have led both Democratic and Republican strategists to conclude that the 2020 presidential contest may feature the highest levels of turnout in more than a century. The GOP polling firm Public Opinion Strategies projects record turnout among non-white voters.

“Looking ahead to 2020, it is reasonable to expect another historic level of turnout, perhaps approaching 160 million votes or more,” wrote Yair Ghitza, the chief scientist at the Democratic analytics firm Catalist.

The small-dollar surge has benefitted both Democrats and Republicans. Both President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE’s campaign committee and Democratic presidential candidates receive more of their money from small donors than from larger donors.

About half of the individual contributions Trump has taken in have come from small-dollar donors, according to his campaign’s federal fundraising reports. That means his campaign has attracted at least 41,000 small-dollar donors, though the total numbers are likely much higher.

A Trump spokesman did not immediately respond to requests to detail the campaign’s small-donor program.

Among leading Democratic candidates, more than three quarters of those giving to Sen. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) have given less than $200, while about two-thirds of Sen. Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE’s (D-Mass.) donors fall in the same range, according to data compiled by ProPublica.

Former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE and Sen. Kamala Harris Kamala HarrisHundreds of lawyers from nation's oldest African American sorority join effort to fight voter suppression Biden picks up endorsement from progressive climate group 350 Action 3 reasons why Biden is misreading the politics of court packing MORE (D-Calif.) have each relied on small-dollar donors for about 40 percent of their total receipts.

More than half of the contributions that have rolled in have come from mobile devices, ActBlue said, a sign that donors are responding to candidate emails and pitches as soon as they arrive in a donor’s inbox. Mobile donations were most likely to come in early in the morning or late at night, before or after work hours.

-- Updated on July 18, at 1:08 p.m.