Suzan DelBene contributed another $900,000 to her campaign for the 1st Congressional District, bringing her personal spending on the state’s most-contested federal race to $1.9 million.

The new self-financing, which dwarfs the combined fundraising by her four fellow Democrats, allowed DelBene to up her TV advertising budget by $547,000, according to Thursday’s new FEC filings.

DelBene, a former Microsoft corporate vice president, spent more than $2.2 million of her own money on an unsuccessful challenge in 2010 of U.S. Rep. Dave Reichert in the 8th District. DelBene’s primary Democratic challenger, Darcy Burner, said at a debate Wednesday that DelBene “would try to buy the election.”