Darcy Burner holds a wide lead among Democrats running in Washington state’s open 1st district, according to an internal poll released today by her campaign.

The poll, conducted by Lake Research Partners, found Burner with 45 percent among voters who picked a Democrat in the top-two primary. Burner was followed by former state Rep. Laura Ruderman with 15 percent, state Sen. Steve Hobbs with 13 percent, former Microsoft executive Suzan DelBene with 12 percent, state Rep. Roger Goodman with 10 percent and tech executive Darshan Rauniyar with 5 percent.

Snohomish County Councilman John Koster is the only Republican currently in the race to replace Rep. Jay Inslee (D), who is running for governor. Koster’s numbers were not included in the polling memo.

The poll was conducted of 504 likely primary voters from Jan. 23 to Saturday and had a 4.4-point margin of error.

The redrawn 1st is now the most competitive district in the state, and the general election will most likely be between a Republican and Democrat.

Burner twice challenged Rep. Dave Reichert (R), losing in 2006 and 2008. DelBene lost to Reichert in 2010, and both were drawn into the 1st by the state’s bipartisan redistricting commission.