A Democrat to watch — Allentown, Pennsylvania's first Latino mayor, Matt Tuerk

Allentown Mayor Matt Tuerk (right) points to his Lehigh Valley region of Pennsylvania. He’s joined by another native of that state, U.S. Rep. Ro Khanna, a Democrat who now represents Silicon Valley in California. (Photo By Douglas Burns).

LEHIGH VALLEY, Pennsylvania

Few politicians I've encountered in three decades of journalism inhabit the intersection o…