Senator Marco Rubio appeared on Fox News Sunday with Chris Wallace this weekend and gave viewers a clear understanding why many conservatives see him as a strong candidate to be Mitt Romney’s running mate. Rubio answered Wallace’s questions directly and forcefully, drawing sharp contrasts between Obama’s record and the Republican vision for the next four years.

Part of what makes Rubio so effective, beyond his obvious grasp of the substance of the policies being discussed, is the tone he uses to criticize the Obama administration. It’s not so much anger, though some anger might be warranted, but disappointment. So when Rubio talks about Obama’s failings on the economy, he reminds viewers of the promises Obama made – to revive the economy and restore the faith of Americans in their government – and laments the president’s inability to deliver. He did the same thing when asked for his reaction to the Obama administration’s use of the death of Osama bin Laden.