Candidates trade Social Security policy accusations By MARSHA SHULER mshuler@theadvocate.com Capitol news bureau State Treasurer John Kennedy accused two of his U.S. Senate opponents on Monday of robbing the Social Security trust fund to pay for tax cuts for the rich. That and other accusations came flying as the four major candidates in the Nov. 2 Senate election squared off during the first of three statewide televised debates this month. U.S. Reps. David Vitter and Chris John voted for $1.3 trillion in tax cuts pushed by President Bush, Kennedy said. "Do you know where they got the money to fund...