Several medical experts believe President Joe Biden needs to be fully evaluated and tested for Parkinson’s disease if he wants to stay in the race. According to experts, Biden has been exhibiting various symptoms of Parkinson’s, including a slowed walk, slight lurching inertia when starting a step or turn, flat face (hypomimia), a staring look with diminished blinking and a low raspy voice (hypophonia), all occurring together. “The pathologic elements seem fully aligned,” one doctor who has treated many Parkinson’s told law professor and blogger Paul Campos. Dr. Kevin Cannard, a Parkinson’s di…