It's just past midnight on a freezing Saturday night in Washington, D.C.
In the last hour, five ambulances have arrived at the emergency room where I work. A sixth pulls up.
The paramedics wheel out a stretcher carrying a man, 73, strapped to a hard board, a precaution in case his spine is fractured. There's blood around his neck brace and a strong smell of urine.
"We found him by his bed," a paramedic tells me. The patient told the paramedics he slipped. "Reports back pain and some cuts and bruises," one of them adds.
Start with a big ballroom at a resort hotel just outside D.C. Add thousands of conservative activists. Stir in hundreds of political journalists, and you've got an irresistible attraction for any Republican presidential hopeful.
For those with their eye on the Oval Office, it's also an early audition before a key audience.
It's the annual Conservative Political Action Conference — CPAC for short — where there's always talk of the next presidential election. This year as many as 10 possible 2016 candidates were invited to speak during the three-day event.