Obama should've taken a break in campaigning

I just listened to President Obama give a campaign speech in Las Vegas. He said that we lost four Americans.
Why is he campaigning at all after the terrorism that hit our embassies in Egypt and Libya? Certainly a break in campaigning would show the world how seriously we view these events, which happened as we commemorated the awful day of Sept. 11, 2001.
Why aren't our flags at half-staff? Where is a harsh verbal response by our elected Congress, together with the president? Have we no courage? And because of it, what will happen to us next?
Janet Pope Schumer