Since NOV, some (including myself) have speculated that Trump has a ceiling of about 48%... and nothing has disproved this theory yet. He has not had more than 47% of the delegates, nor more than 49.3% of the vote in any state... and that 49.3 was in MASS, where he will never beat Hillary.
Trump got 100 percent of the delegates in South Carolina.
OTOH, here at Free Republic support for Trump has start to decline since he retreated from his strong anti abortion statements on the 30th....as seen in the on going FR Caucus.