'has a large mandate' is correct and usable in written English.
You can use it when referring to having a great amount of power or influence. For example, "The new president has a large mandate to bring sweeping changes to the country."
The pair have a large mandate for change, with the Fire having finished bottom of the league last year – and being forced to endure New York Red Bulls winning the Supporters' Shield at their stadium probably reinforced how far the original expansion success story has fallen in recent years.
He has an unexpectedly large mandate, but India is not Gujarat.
While the London mayor's powers are limited, the office will have a larger popular mandate than any other in British public life and comes with Mr. Livingstone's favored piece of furniture: a soapbox.
And as Reagan did with Medicare, Judge Hudson argued that the mandate had a larger meaning: he said it "would invite unbridled exercise of federal police powers".
It suits Brexiters here and Trumpeters on the other of the Atlantic to roar that they represent "the people", for this helps them in their ambition to claim a larger mandate than they have been awarded, just as it also serves their endeavour to silence any dissent.
In the parliament no single party has a clear mandate and the largest party, Congress, is beholden to smaller regional allies for majority.
Joy Ball: A clear and overwhelming mandate for the status quo! Let's put this NO vote into perspective... a clear and large majority of votes (55.303%) responded NO to independence - this represents a differential of over 10%; yet a margin of 1000 times smaller in favour of YES (50.005% vs 49.995%) would have been sufficiently large mandate for Scotland to have been independent this morning!
