At NATO summit, warm welcome for most leaders, but not Pakistan's

President Obama won't meet with Pakistani President Asif Ali Zardari. U.S. officials are furious over Pakistan's refusal to reopen supply routes to Afghanistan.

CHICAGO — As thousands of protesters marched in the streets, President Obama welcomed more than 60 world leaders to his heavily guarded hometown for a NATO summit that will start the clock for America and its allies to begin pulling combat troops from Afghanistan.

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