When Wilmot introduced his proviso, therefore, he released the pent-up ire of northern Democrats, many of whom cared less about slavery in new territories than about their power within the party. Northern Whigs, who had a more consistent antislavery record, were delighted to support the proviso. This bipartisan northern coalition in the House passed it over the united opposition of southern Democrats and Whigs. This was a dire omen. The normal pattern of division in Congress had [Page 54] occurred along party lines on issues such as the tariff, the Bank, federal aid to internal improvements,
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