Four weeks before the Democratic primary for county executive, incumbent Isiah Leggett holds a better than 3-to-1 fundraising advantage over Doug Duncan, with $1 million cash on hand, according to campaign finance reports posted Tuesday at the Maryland Board of Elections.

A filing from the third candidate in the race, Council member Phil Andrews, was not available on the Board of Elections site as of early Tuesday evening.

Leggett outraised Duncan $311,000 to $258,000 during the period covered by the new reports, from Jan. 9 to May 20. Filings show Duncan with $343,000 in total receipts after expenses of $245,000. Leggett shows just over $1 million.

The cash advantage positions Leggett to stage an overwhelming blitz of mail, television, radio and online advertising in the month before the June 24 primary. He began airing his first television spot Tuesday.

Among Leggett’s major expenditures listed in the latest report is $29,000 for a March poll from Hart Research Associates of the District. Duncan’s report shows no money spent for polls.

This post was corrected to remove references to an older filing from the Duncan campaign.