CHICAGO — Despite legislative setbacks and an ongoing battle with a powerful Detroit family, the leaders of Michigan and Canada continue to tout as a top priority a new $4 billion bridge to span the nation's busiest trade route between Detroit and Canada.

Gov. Rick Snyder has highlighted the project in both of his state of the state addresses, saying Michigan's future depends on its role as an exporter, and vowing that no tax money would back the debt used to build the span.

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