WASHINGTON – On the brink of a second term, President Barack Obama invoked Martin Luther King Jr.’s commitment to service Saturday as inauguration-goers flocked to the capital city for a distinctly American celebration including an oath-taking as old as the republic, a splashy parade and partying enough to last four years.

“I think we’re on the cusp of some really great things,” Vice President Joe Biden predicted for a country still recovering from a deep recession.

Freshly built inaugural stands at the Capitol gleamed white in the sun, and hundreds of chairs for special guests were set out on the lawn that spills down toward the National Mall as the president and vice president began their inauguration weekend.