Democrat Colleen Hanabusa received the largest amount of campaign contributions during the last three weeks in the special election to fill Hawaii's vacant congressional seat, according to federal campaign contribution data analyzed Thursday by The Associated Press.

Almost half of the $76,400 she collected between May 3 and May 19 came from labor unions, the data showed.

Meanwhile, nearly a quarter of the $68,700 Democrat Ed Case picked up in the last three weeks was given by family members, including AOL co-founder Steve Case, and tech industry leaders.

And more than a third of the $41,200 in donations to Republican Charles Djou came from GOP members of the U.S. House.

The candidates are vying for the 1st Congressional District seat, from which Democrat Neil Abercrombie resigned in February to run for governor. Results in the all-mail election are expected Saturday. Djou has been leading in recent voter polls, the last of which is two weeks old.

The candidates previously filed two sets of reports that detailed their campaign contributions and expenditures during the first quarter of the year and from April 1 through May 2. After that, they are required to report individual donations exceeding $1,000 within 48 hours.

The data for those so-called late contributions was compiled by the Federal Election Commission at the AP's request.

It shows a modest number of contributions for all three contenders — 40 for Case, 36 for Hanabusa and 25 for Djou.

Campaign expenditures over the three-week period leading up to Saturday do not have to be reported to the FEC until June 21.

Typically, one of the biggest expenses for congressional candidates is the production of television ads and the purchasing of air time — and all three candidates have frequently aired ads in recent weeks.

Since May 3, labor union political action committees have directed large sums of money to Hanabusa's campaign — as they did in previous months.

Of the $76,400 Hanabusa reported receiving the last three weeks, $5,000 each came from unions representing carpenters, transit workers and employees in the hospitality, food service and gaming industries. A union representing bricklayers gave her $4,000.

She also collected $1,000 each from military contractors General Dynamics and Northrop Grumman, and $5,000 from a trial lawyers group.

Of the $68,700 Case garnered since May 3, family members gave $9,600. That includes $4,800 from Steve Case, chairman of Revolution LLC. Other relatives have donated previously.

Contributions to Case from people associated with the technology industry also included $1,000 from Sheryl Sandberg, Facebook's chief operating officer; $2,400 from Timothy Draper of the Menlo Park, Calif., venture capital firm Draper Fisher Jurvetson; and the same amount from Robert Rees of the Palo Alto, Calif., company Startup Capital Ventures.

Case also picked up $10,000 from the Blue Dog PAC, a coalition of moderate House Democrats of which he was a member when he represented Hawaii's 2nd Congressional District from late 2002 through 2006.

Of the $41,200 Djou brought in since May 3, more than $17,000 was given by political committees maintained by GOP House members. Those donations included $4,000 from John Shimkus of Illinois, and $2,000 each from Adrian Smith of Nebraska and Jerry Lewis of California.

Djou also received contributions from PACs representing McDonald's, Valero Energy Corp., the Bank of Hawaii and Home Depot. The Republican Majority for Choice PAC, which backs GOP candidates who support abortion rights, also gave Djou $2,000.