Former Gov. Angus King continues to raise large sums of money for his U.S. Senate campaign, nearly reaching $900,000 in donations during the first four months, according to his latest campaign finance report.

King raised $470,909 in just over one month — May 24 to June 30 — according to the filing.

The latest quarterly report, a copy of which was provided to the Portland Press Herald on Sunday, says King had $503,444 left to spend as of June 30.

King, an independent candidate for the seat being vacated by Sen. Olympia Snowe, R-Maine, is certain to be far ahead of his opponents in fundraising when all of the reports are made public this week. The Federal Election Commission is expected to have all the Senate candidates’ detailed reports posted online by the end of the week.

Democratic candidate Cynthia Dill released a copy of her report Friday showing she had raised $91,166 so far in the campaign and had $28,522 in her account as of June 30.

Republican Charlie Summers had not released his report as of late Sunday. Summers had raised nearly $90,000 through May 23, according to earlier filings, and he was expected to have doubled that total by the end of June.

Summers and Dill have tried to step up fundraising since winning their party’s nominations in the June 12 primary. Polls putting King well in front among likely voters may be posing a challenge, however. A Press Herald poll last week, for example, found that King had the support of 55 percent of voters surveyed, while Summers had 27 percent and Dill had 7 percent.

King, who has the most personal wealth of the three major Senate candidates, has contributed only about $500 of his own money, along with a $37,000 loan early in the campaign, according to his report.

He reported a total of $63,337 in donations from political action committees, or PACs, by June 30. That includes $10,000 from the American Association for Justice PAC, $10,000 from Engineers Political Education Committee and $2,500 from the American Health Care Association PAC.

Staff Writer John Richardson can be contacted at 791-6324 or at:

jrichardson@pressherald.com