Many people around the world are probably wondering why Hillary Clinton — who is obviously more prepared and better suited for the U.S. presidency than her opponent, Donald Trump — isn't waltzing to victory. Many Americans share the world's bewilderment.

National opinion polls may well continue to fluctuate until the election on Nov. 8. But Trump has been closing in on Clinton in recent weeks, even threatening to catch up with her in the Electoral College vote, where the Democrats' control of some of the most populous states (New York and California) give Clinton an advantage. Why is this happening?

For starters, Trump, despite knowing almost nothing about governance or public policy, has managed to consolidate most Republicans behind him. One motivation is Republicans' long-held hatred of Clinton. Another is the Supreme Court; the court already has one vacant seat for the next president to fill and is likely to have more over the next four years.