Kerry had fine reasons too for explaining away an inconvenient fact.
Clay authored the bill.
(from Wiki...again): "In an elaborate scheme to prevent passage of still higher tariffs, while at the same time appealing to Andrew Jacksons supporters in the North, John C. Calhoun and other southerners joined them in crafting a tariff bill that would also weigh heavily on materials imported by the New England states.
"It was believed that President John Quincy Adamss supporters in New England, the National Republicans, or as they would later be called, Whigs, would uniformly oppose the bill for this reason and that the southern legislators could then withdraw their support, killing the legislation while blaming Adams.