I am, "Sir, "Your most Obedient and most Humble Servant, "ISAAC BICKERSTAFF." Montagu was also interested in politics.

He was a staunch Whig, and in favour with the leaders of his party.

He sat in the House of Commons from 1705 to 1713 as member for Huntingdon, where there was family interest.

It was not, however, until after the accession of George I that he held office.
At first, it may be, Montagu took some kind of paternal interest in Lady Mary.

This attitude did not long endure.