… Presidential nominees leading throughout the primary campaign has been the exception, not the rule, for Democratic candidates over the past six decades. This has been the case for a variety of reasons — including because some eventual nominees didn’t enter the race until late in the campaign or because the early frontrunner dropped out along the way. Republican nominees, meanwhile, have tended to lead the pack for the entire campaign, with a few exceptions. CONT.
Lydia Saad, Gallup