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Morning roundup

Top Stories: Debt Limit History; Signing Up For Obamacare

It's Columbus Day, and here are our early stories:

— How The Debt Limit Became 'A Nuclear-Tipped Leverage Point'.

— So What's The Real Deadline For Obamacare Sign-Up?

And here are more early headlines:

Nobel Prize In Economics Awarded To Three Americans. (New York Times)

Little Progress In Senate Shutdown/Debt Ceiling Talks. (Politico)

Thousands Of Cattle Lost To Blizzard; Congress Can't Help Ranchers. (NBC)

Scores Die In Hindu Temple Stampede In India. (Reuters)

Aid Workers Still Missing In Syria; Red Cross Calls For Their Release. (UPI)

Calls For Action After Another Migrant Boat Sinks In Mediterranean. (Deutsche Welle)

Two Tropical Storms Swirling Off Mexico's Pacific Coast. (AP)