Break out Plan B — for “Bullshit.”

A top McCain adviser signaled last week that the campaign intends to “turn the page” from economic issues — which polls show have staked Obama to a significant lead — and ramp up attacks on Obama as an inexperienced ultraliberal.

“I know the policies he’s supported these past eight years and wants to continue are pretty hard to defend,” Obama told a rally at a high school football stadium. “I can understand why Sen. McCain would want to turn the page and ignore this economy.”

McCain and his agents are “gambling that he can distract you with smears rather than talk to you about substance,” Obama added. “They’d rather try to tear our campaign down than lift this country up. It’s what you do when you’re out of touch, out of ideas and running out of time.”

McCain’s course correction reflects a growing case of nerves within his high command as the electoral map has shifted significantly in Obama’s favor in the past two weeks.

“It’s a dangerous road, but we have no choice,” a top McCain strategist told the Daily News. “If we keep talking about the economic crisis, we’re going to lose.”

Insults fly as Barack Obama & John McCain prepare for second debate.