Almost $7 million flowed into Colorado’s U.S. Senate race between April and June, a massive sum in a non-election year and further evidence the closely watched contest could set records.

For Sen. Cory Gardner, his $2 million haul in the second quarter of 2019 – he had nearly $5 million on hand at the end of June – provides him with an expansive and expanding war chest with which to begin batting back his Democratic challengers.

For those Democratic challengers – there are 10 now – the latest fundraising figures revealed clear front-runners, showing who among them is on track to keep their campaigns afloat and raise the large amount of money most will need to place their names on a ballot next year.

Gardner continues to pull in large donations, typical of a Senate incumbent. Six percent of his donations came from small-dollar donors, those who give $200 or less, according to a ProPublica analysis. Casino magnate Sheldon Adelson and his wife both donated the maximum amount allowed, $2,800. So, too, did executives at Xcel Energy, Merck, Visa and FedEx, among others.

Gardner received $626,097 from political action committees, including PACs for ExxonMobil, Alliance Coal, Arch Coal, Chevron, Murray Energy, the Western Energy Alliance, Eli Lilly, Facebook, Raytheon, the private prison company CoreCivic, Walmart, Goldman Sachs and the commissioner of Major League Baseball, according to Federal Election Commission records.

Casey Contres, Gardner’s campaign manager, said in a statement last week that Gardner’s strong fundraising quarter “allows him to continue to build the necessary resources to defeat whichever far-left candidate the Democrats nominate next June.”

Mike Johnston, a former state senator, continues to be a prolific fundraiser. He topped the Democratic field last quarter, hauling in nearly $1.6 million and leaving his campaign with more than $2.6 million on hand at the end of June, more than other Democratic candidates combined.

Donations to the Johnston campaign came from executives at Disney, Microsoft, AT&T, Warner Bros., Yelp, the Denver pork company Tender Belly, Etsy, United Way, Square and many more. Like other Democrats in the race, he isn’t accepting PAC money. Five percent of Johnston’s donations came from small donors, according to a ProPublica analysis of his FEC filings.

J.J. Abrams, the filmmaker, gave the maximum of $2,800. So, too, did former NFL quarterback Brian Griese and Detroit Red Wings defenseman Mike Green. Jane Hartley, a former U.S. ambassador to France, sent $2,800, as did a consultant for the controversial consulting firm McKinsey & Co. John Thompson III, a former Georgetown basketball coach, wrote a check for $500.

Dan Baer, a former diplomat and executive director of Colorado’s Department of Higher Education, raised $1.35 million during his first fundraising quarter since entering the Senate race and had more than $1 million to spend on his Democratic campaign at the end of June.

Executives at Netflix, Google, Lockheed Martin, Starz and Spotify chipped in. So, too, did former Colorado first lady Robin Hickenlooper, with a $2,800 donation. TV writer and producer Peter Nowalk (“Greys Anatomy,” “Scandal”) donated $2,800 to Baer, as did producer Nick Pepper (“Quantico,” “Designated Survivor”) and writer Dave Hill, who worked on “Game of Thrones.”

Former U.S. Attorney John Walsh’s $777,000 came largely from attorneys and former prosecutors, including maximum donations from former Attorney General Loretta Lynch, former Deputy Attorney General Sally Yates, and checks from a half-dozen former U.S. attorneys. Frank Azar, the high-profile Colorado attorney, donated to Walsh’s campaign as well.

Andrew Romanoff, a former Colorado House speaker, brought in just over $500,000 between April and June, leaving him with $730,000 to start July. Donors included former state Rep. Randy Fischer, former state Sen. John Kefalas and the CEO of Craig Hospital in Englewood.

“Andrew’s strong track record and message of fighting for universal health care, combating the climate crisis, fixing our broken immigration system, and investing in our public schools is clearly resonating with Coloradans,” said Tara Trujillo, his campaign chair.

Alice Madden, a former Colorado House majority leader, has raised nearly $200,000 since entering the race May 9. That includes a $40,000 donation from Madden to her campaign, and a $50,000 loan to her campaign. Aaron Bly, her campaign manager, said Madden can “build the strongest coalition of any candidate in this primary.”

Ellen Burnes raised $122,000, but told supporters in an email last Friday she was dropping out “to pursue other community-focused leadership.” Stephany Spaulding, a pastor and professor, has brought in $98,100, some of which was transferred from another committee. Environmentalist Diana Bray raised $72,514, including $9,140 from her and a $10,000 loan to her campaign.

Trish Zornio, a scientist from Superior, raised $14,239 and had $21,332 on hand at the end of June. Denver activist Lorena Garcia raised about $12,000 and was nearly out of money by the end of June. The latest candidate to enter, state Sen. Angela Williams, joined after the fundraising quarter and therefore has not yet filed a report with the Federal Election Commission.