Amid fears the United States risks default if lawmakers don't raise the debt ceiling on time, some are suggesting President Obama could save the day by big-footing Congress. How? By invoking the Constitution and directing Treasury Secretary Tim Geithner to keep borrowing even if it means going past the statutory borrowing limit. Really? They say default -- and by extension, the debt limit -- violates the 14th Amendment. The amendment states: "The validity of the public debt of the United States, authorized by law, including debts incurred for payment of pensions and bounties for services in suppressing insurrection or rebellion,...