The two leading D.C. mayoral candidates continue to bulk up their war chests for a final-month blitz to the Sept. 12 primary, raising a combined $1.4 million since early June and leaving their competition financially in the dust.

In the most expensive mayor’s race in city history, D.C. Council Chairman Linda Cropp leads Ward 4 Council Member Adrian Fenty in total funds raised during the course of the campaign, $2.54 million to $2.37 million, according to campaign sources and finance reports filed Thursday with the Office of Campaign Finance.