According to a new ABC News/Washington Post poll, President Trump's base of support hasn't eroded much at all, while Hillary Clinton's has:
While just 4 percent of Trump's supporters say they would back someone else if there was a redo of the election, fully 15 percent of Clinton supporters say they would ditch her. Trump leads in a re-do of the 2016 election 43 percent to 40 percent after losing the popular vote 46-44.
That 15 percent is split between those who say they would vote for Trump (2 percent), Gary Johnson (4 percent), Jill Stein (2 percent), and either other candidates or not vote (7 percent).
Out of the four percent of Trump voters who would vote differently if the election were held today, according to the poll, only one percent would have moved to Clinton. Even more interesting, the majority of Trump voters are very happy with the job the president is doing:
Just 2 percent of those who voted for Trump say he has been a worse president than they expected. Only 1 percent say he has been “much worse,” and 1 percent say he has been “somewhat worse.” In contrast, 62 percent say he has been better than expected, with one-third (33 percent) saying he has been “much better.”
Despite President Trump's numerous flip-flops since winning the election (the viability of NATO; china suddenly not being a currency manipulator; the Ex-Im Bank; his changing attitude toward Janet Yellen), and the catastrophic failure that was the American Health Care Act (AHCA) - of which he was an advocate - the majority of his voters believe he's doing an incredible job.
Perhaps it's because the bar was set incredibly low; Republicans didn't expect much. Now that we have a textualist Justice on the Supreme Court in Neil Gorsuch, and the president is showing muscle in dealing with Syria, North Korea, and even Russia (although that's mostly on the part of U.S. Ambassador to the United Nations Nikki Haley), his voters are satisfied.
As far as Clinton's drop in support, that's less shocking. While her true blue supporters were (and still are) "With Her," there were many voters who simply saw her as the lesser of two evils.