You don’t have to be a major voting block to be a consistently consequential swing vote. California is a major voting block but its interests are rarely persuasive in federal politics because it’s never a swing vote in elections.

Logical nitpick: you argued “A does not imply B”, by providing an example of (not A, B). You need (A, not B) to make that argument.

That’s fair. The logic still holds: Ohio’s interests are over-represented in Federal politics even though it’s not major because it’s important on the margins.