It was during Monroe's last term that Henry Clay brought in the first protective tariff bill, as distinguished from tariff bills to raise revenue with protection as an incident only. It was passed by a curiously mixed vote, which hardly indicated any one's future position on the tariff excepting that of Clay himself; Massachusetts, under the lead of Webster, joining hands with the Southern sea-coast states to oppose it, while Tennessee and New York split, and Missouri and Kentucky, together with most of the North, favored it. Benton voted for it, but on the great question of internal improvements he stood out clearly for the views that he ever afterwards held. This was first brought up by the veto, on constitutional grounds, of the Cumberland Road bill, which had previously passed both houses with singular unanimity, Benton's vote being one of the very few recorded against it. In regard to all such matters Benton was strongly in favor of a strict construction of the Constitution and of guarding the rights of the states, in spite of his devoted attachment to the Union. While voting against this bill, and denying the power or the right of the federal government to take charge of improvements which would benefit one state only, Benton was nevertheless careful to reserve to himself the right to support measures for improving national rivers or harbors yielding revenues. The trouble is, that however much the two classes of cases may differ in point of expediency, they overlap so completely that it is wholly impossible to draw a hard and fast line between them, and the question of constitutionality, if waived in the one instance, can scarcely with propriety be raised in the other.