LISBON — One clear blue morning last October, professional opera singer Ana Maria Pinto boarded a bus at 6 a.m. in her hometown in Portugal's north and made her way to an 18th century colonnaded courtyard on this capital city's riverfront.
It was Republic Day, a national holiday, but President Anibal Cavaco Silva's annual speech was closed to the public for the first time. Financially beleaguered Portugal is often hit by anti-austerity protests, and Lisbon's beleaguered officials wanted to avoid confrontation.
So Pinto waited patiently outside.
Then, as Cavaco Silva delivered his closing remarks to an invitation-only crowd, security guards eased open the...