If unionist officials in any county had fraudulently transposed the voting results, the pattern of aberrant support against secession would resemble that of Uvalde County in that the amount of inflated unionist strength would exactly match the extent of discounted secessionist ballots.Throughout Texas the number of Breckinridge voters who subsequently cast ballots against secession was insignificant. However, if all Uvalde County voters who participated in the 1860 election returned to the polls three months later to vote in the secession referendum, then over half of them would have had to "switch" from the Southern Rights Democracy to the unionist camp to achieve the overwhelming anti-secessionist vote registered in their county.
Dale Baum, The Shattering of Texas Unionism: Politics in the Lone Star State During the Civil War Era, Baton Rouge, LA: Louisiana State University Press (1998), p. 63
All the more reason for the seceding states to follow Article IV.