DAVID MARCUS: In Dallas, voters weigh two Senate primaries and now, a war

It was almost the perfect microcosm for current American politics when I met Lizbeth, a lovely young Latina woman who had spent 10 minutes chanting along at the wrong rally. 

She thought she was attending an anti-Trump event that I had also come to cover. Instead there was a small group of mostly Iranians yelling, "No Mullahs, No Shahs!" in support of dissident leader Maryam Rajavi, and for a while, Lizbeth just joined in.

It was easy to sense in Dallas, just by talking to people,...