Washington (CNN) Be afraid, be very afraid.

Lindsey Graham wants to be president -- and he's not running on optimism.

"The world is exploding in terror and violence," Graham, a South Carolina senator, warned on Monday as he launched his long-odds White House bid by laying out an apocalyptic vision in his sunny home state.

This is not 'Morning in America' or a hope-and-change campaign. Instead, Graham, a Republican, sees a world where radical Islam is on the march, "rogue nations" like Iran and North Korea are bristling with threats and the security of the homeland can't be guaranteed.

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