Author: Bill Barrow & Nicholas Riccardi, The Associated Press

HOUSTON – Democratic debate night No. 3: Attacks and counter-attacks. Love for one former president, loathing for the current one. A 76-year-old front-runner essentially got called old, and he turned around and called another rival a “socialist.” But will it change the fundamentals of a nominating fight that remains remarkably stable at the top with five months until voting…