Biggest Security Threat Facing USA?

Partisan bigotry.

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"All the problems we face in the United States today can be traced to an unenlightened immigration policy on the part of the American Indian."

~ Pat Paulsen for President

The Atlantic's Jeffrey Goldberg conducted what he's calling an "interview" with Barack Obama regarding Israel, but it sounded much more like an inquisition.

Goldberg repeatedly demanded that Obama swear his devotion to Israel and affirm prevailing orthodoxies ("I'm curious to hear you talk about the Zionist idea. Do you believe that it has justice on its side?"; "Go to the kishke question, the gut question: the idea that if Jews know that you love them, then you can say whatever you want about Israel, but if we don't know you –- Jim Baker, Zbigniew Brzezinski –- then everything is suspect. There seems to be in some quarters, in Florida and other places, a sense that you don’t feel Jewish worry the way a senator from New York would feel it"; "Do you think that Israel is a drag on America's reputation overseas?"; "If you become President, will you denounce settlements publicly?"). Afterwards, Goldberg pronounced himself satisfied:
"Obama expressed -- in twelve different ways -- his support for Israel to me."

Biggest security threat facing America is voter apathy, the cancellation of the news, and the cancellation of teaching civics in Junior H.S., High School, and College.

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AMERICA LAND OF THE FREE HOME OF THE BRAVE--BECAUSE OF OUR CONSTITUTION.