Is Kucinich correct in saying that Obama approving air strikes in Libya is an impeachable offense?

“President Obama moved forward without Congress approving” the liberal Ohio Democrat told Raw Story. “ He didn’t have congressional authorization, he has gone against the Constitution, and that’s got to be said.” Several other members of Congress have also chastised the Obama administration for not doing enough to sell the intervention to Congress, let alone to the American people.”

Were these air-strikes without Congressional approval against Constitutional law? Should the President be impeached or will he get a pass like Bush and Cheney did?

Story here