* David Gergen: The noose around Libyan leader Gadhafi is tightening
* NATO has escalated bombing; diplomatic and economic pressure is mounting
* He says if Gadhafi is forced from power, Obama's approach will be vindicated
* Gergen: It's not clear if a new regime in Libya would be friendly to the U.S.
http://edition.cnn.com/2011/OPINION/06/08/gergen.libya.gadhafi/index.html
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