It was a dangerously narrow constituency for one who hopes to rally a disparate party in November.
But it still faces stumbling blocks in the House, whose members must respond to narrower constituencies.
The Government looks to a narrow political constituency: 5 million whites in a nation of 33 million.
Under the current system, candidates find themselves tailoring their messages to small, often narrow, constituencies.
It has a more narrow constituency than the space station, which provides tens of thousands more jobs in a score of states.
And on the final spending bill, expected to pass Congress on Tuesday, they attached hundreds of policy items for narrow constituencies.
"It's different being a legislator representing a narrow constituency than it is to be County Executive representing 1.3 million people," he said.
Throughout the crisis until now, the Taliban's statements appear to have been aimed primarily at a narrow constituency of militant Islamic groups around the world.
Sometimes it is a narrow but politically powerful constituency, like the agriculture or energy industries.
This remarkable pact deserves better than nibbling by narrow constituencies.