Montgomery County Executive Isiah Leggett has opened up a better than 3-to-1 cash advantage over Democratic primary opponent Doug Duncan in his bid for a third term, according to reports filed Wednesday with the Maryland State Board of Elections.

Leggett reported donations of $653,986 over the past year and $971,159 total cash on hand, including funds from prior campaigns. Duncan, the former three-term county executive (1994-2006), disclosed contributions of $409,834 and $330,120 in the bank. The filing shows he spent heavily on staff and other support to get his campaign up and running against the incumbent Leggett.

The third candidate, Council member Phil Andrews (D-Rockville-Gaithersburg), trails significantly, with contributions of $106,631 and a total of $117,978 cash in the bank.

Leggett’s strong showing was built on a range of contributions, including four-figure donations from supporters in the real estate sector such as Pulte, the Peterson Co. and Gudelsky, and smaller sums as well. They came from community activists, small business owners and a long roster of county department heads, such as Transportation Director Arthur Holmes, General Services Director David Dise and Finance Director Joseph Beach.

Duncan drew money from some of the same traditional deep pockets, including a few that Leggett did not, such as the Montgomery-based Marriott family and Marriott International ($7,000) Foulger-Pratt ($4,000) and the Montgomery firefighters’ union ($6,000).

But Duncan also spent heavily to put a campaign organization back on its feet after last running for office in 2006. That year he dropped out of the Democratic gubernatorial primary after being diagnosed with depression.

Wednesday’s report showed that he spent heavily on senior staff, bringing on his son John Duncan as political director and Kurt Staiger, former deputy campaign manager for Rep. John Delaney (D-Md) as campaign manager. Together they’ve been paid more than $100,000 in salary since early 2013. Duncan has also paid fundraising consultant Rachael Rice about $80,000.

Leggett, who got a relatively late start after announcing his decision to run again in early summer, reported just $67,709 in salary and other expenses.