According to this King5 poll, yes:

In a poll of 617 registered voters statewide, conducted on landlines and cell phones, 46% told SurveyUSA they would vote for McKenna, while 43% said they would support Inslee. A couple months ago, McKenna’s lead over Inslee was six points. The poll has a margin of +/- 4%.

When asked about specific issues, voters in the poll expressed more confidence in McKenna on managing the state budget—44% say the attorney general would do a better job than 35% for Congressman Inslee. And on education, McKenna leads as well (40% to 35% for Inslee).

However, Inslee does better if voters make their decisions on social issues and the environment. In the poll, 43% say Inslee better reflects their position on social issues, compared to 40% for McKenna. And on the environment, a hallmark issue for Inslee, he has a double-digit advantage with 45% saying Inslee would be stronger than McKenna, whom 30% felt would be better for the environment.

Inslee hasn't laid out any specific budget platforms, so there's room for him to close the gap in that area, and his lead on social issues will only get stronger (in Seattle, at least, which is where he needs support) as the debate over gay marriage and the Reproductive Parity Act—which would require all health insurance policies sold in Washington that offer maternity coverage to also cover abortions—heats up. McKenna remains conspicuously silent on women's reproductive rights and nearly incoherent (but disapproving) when it comes to allowing lesbians and gays marry.