The phrase "a large constituency of" is correct and usable in written English.
It can be used when referring to a significant group of people who share a common interest or opinion, often in a political or organizational context.
Example: "The senator has a large constituency of supporters who advocate for environmental protection."
Alternatives: "a significant group of" or "a broad base of".
Whitehall I find a horribly synthetic performer, who appears to replace honesty with effort and has found a large constituency of people who don't much care.
Westminster City Council, which has a large constituency of wealthy homeowners to placate, has a reputation for enthusiastic enforcement of its own regulations.
And the firebrand cleric, Muqtada al-Sadr, who has a large constituency of radical Shias, has also declared himself against the draft, though he may yet relent, as he has done on other issues before.
And there's a larger question, too, about whether the Tea Party (which, polls show, has a large constituency of religious conservatives) will turn to social issues, from which it has mostly shied away.
Unsurprisingly, there is a large constituency of directors and writers who are gay, but currently very few people in theatre with the appetite for chronicling and exploring gay culture and gay stories.
"A large constituency of working-class voters feel that not only has the economy left them behind, but so has the culture," the American political philosopher Michael Sandel said in a recent interview.
Copeland is a large constituency on the Cumbrian coast, taking in Whitehaven (the old name of the constituency), part of the Lake District National Park and the Sellafield nuclear power plant.
Mr. Putin agreed, and he seemed to be positioning himself to arrive at the summit meeting this week, where he is to meet Mr. Bush for the second time, as the spokesman for a larger constituency of countries disaffected with American leadership.
If you assume that more than 60% of the electorate are not planning to vote Labour, and even more are not planning to vote Conservative, then there is a large constituency to whom the idea of another hung parliament could conceivably appeal.
The new government had a large constituency to whose needs it had to respond to.
With 2012 fast approaching, though, Reed can still appeal to a large constituency: 44% of GOP primary voters – and about a quarter of the national electorate – identify as born-again Christians.
