From NBC here. Key findings:

[A]ccording to a brand-new NBC News poll, 47% of Americans — a plurality — oppose the public plan, versus 43% who support it. That’s a shift from last month’s NBC/WSJ poll, when 46% said they backed it and 44% were opposed.

In a follow-up question explaining the benefits and disadvantages associated with a public plan, 45% said they agreed with the description — by supporters — that it would help lower health-care costs and provide coverage for uninsured Americans.

But 48% sided with opponents who say a public option would reduce access to their choice of doctors, and would lower costs by limiting medical treatment options.

UPDATE: The WSJ piece about the poll is here.

The Daily Kos has a liberal-leaning analysis of the poll here, and HotAir.com has a conservative-leaning analysis here.