Then he heads to London for an event at 6:30 p.m. SIGN WARS — Oh, the power of a colorful piece of corrugated plastic. Do lawns reflect the state of a race? Do they demonstrate real momentum?

Ms. Nhim Rorn and her son in front of their poor makeshift house, made of plastic sheets for a roof and with no walls. As she toiled under the scorching sun in the fields of Banteay Srei, in the ...