In a primary for Seattle Mayor, one month until votes are counted, incumbent mayor Greg Nickels advances to the November general election, according to this latest exclusive KING-TV poll conducted by SurveyUSA — but the identity of his November opponent remains unclear, with four candidates within six points of each other.

Today, Nickels takes 26% of the vote, up 2 points from an identical SurveyUSA poll released three weeks ago.
City Council member Jan Drago takes 15%, down 1 point.
Former Seattle Sonic James Donaldson takes 11% today, down from 14%.
Businessman Joe Mallahan takes 8%, up 1 point.
Community organizer Mike McGinn also takes 8%, unchanged from the previous poll.

Three other candidates combine to take 6% of the vote. 1 of 4 likely voters are undecided today, 13 days before ballots begin to be mailed in the all-mail primary.

Nickels, who is seeking a third term, leads among both men and women, among voters of all age groups, and among those who identify themselves as Democrats and as Republicans. The office is non-partisan, though Nickels is a member of the Democratic Party. Among Independents, the nominal lead in the race has changed three times: Nickels led by 3 points six weeks ago; Donaldson led by 3 points three weeks ago; today, Drago leads by 2 points among independents.

Full results of this poll can be found here .