On Monday, the top four candidates hit the streets to win over those undecided voters.
State Sen. Ed Murray is the current front runner with a slim one-percent lead in recent polls. Murray spent his day walking the Capitol Hill business district talking to business leaders.
With the race still incredibly close, Murray believes he has the edge.
"I think it's the ability to actually accomplish something - to actually work together to change the contentious attitude that we've seen in city hall these last three and a half years," he said.
Incumbent Mayor Mike McGinn is still very much in the race, and he spent his Monday burning up the phone lines, which campaign advisers say is what turned the tide during McGinn's first mayoral campaign.
"I think when they take a close look at the work we've done and the direction the city is heading, we're getting a good response," McGinn said.
Former City Councilman Peter Steinbrueck has been beating the pavement for days. He's currently running in third in the primary race that will winnow out all but the top two vote getters.
Steinbrueck has a solid constituency and said the polls don't consider the large block of undecided voters.
"I'm really excited about the possibility of making it into the general so we can have some real debate about the future of this city," he said.
Bringing up the bottom of the top four candidates, Councilman Bruce Harrell is reportedly seeing a late surge in support. He's hoping to keep the momentum going by working the phone banks and focusing on the 25 percent of voters who have yet to decide on a candidate.
"And quite honestly, the stakes in our city are very high, and now people are really being discerning on who they want," Harrell said.
The King County Elections Office was already projecting a low turnout of about 33 percent, but on Monday officials say it could turn out to be much lower.
Voters have to have their ballots turned in by 8 p.m. on Tuesday.