Joke About Congress

The Mexican War was declared on this date in 1846, even though fighting had already started. Typical of Congress, you know, to see things after the fact. "What, there's a war on? Ought we to declare it or something?"

Or better: "You started a war without us? How could you?"

Or perhaps even better than that: 

Congress: "Let's declare war on Mexico."

Someone shouting from the gallery: "It's already on."

Congress: "We'll call for troops, authorize extra spending for the military, draw up battle plans...wait, what?"