All the memories Saturday at the Preakness will harken back to a year ago, when Barbaro had his tragic accident. “No way you don’t see Barbaro coming out of that starting gate, coming down that track,” said Scott Palmer, a veterinarian who rushed to Barbaro’s side when the Kentucky Derby winner pulled up seconds after the start, his right rear leg flaring out grotesquely. “I think everyone is going to take a deep breath and say, ‘Let’s hope everybody comes home safe.’” But this year’s Derby winner, Street Sense, is looking to grab the attention for himself. However, Street Sense may have to battle the elements. While the weather turned out to not be a factor in the Derby, Saturday’sforecast calls for a 60 percent chance of rain. Six of the nine entries have not competed on an off track.