“Somewhere along the way, we stopped seeing the other side as friends and neighbors. We no longer just disagree with them; we have no respect for them.” Worcester’s Raymond V. Mariano has seen the inside of many political campaigns. One of Whitey Bulger’s goons even sought him out in South Boston once. The former mayor and housing authority director — and the Sun’s newest contributor — has advice all of us can follow on the day after the election. It just might help make our nation stronger.