What effect does Casca's response have on Cassius?

The effect that Casca's response has on Cassius is that Cassius tries to get Brutus to join them.

Explanation:

In this passage of William Shakespeare's "The Tragedy of Julius Caesar," Casca clearly states to Cassius that he is not a smiling, two-faced tattletale and wants to join hands with him in whatever he's planning.

He also promises that he will go as far as any one of them. As soon as he makes this statement, Cassius reveals about the meeting at night to discuss the steps of an honorable but dangerous mission.