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MILWAUKEE (CBS 58) -- With a federal government shutdown all but certain, a Marquette political expert says this one is likely to feel different from those in the past.

Both Democrats and Republicans are digging in over fiscal issues, but there's a larger philosophical battle beneath the surface.

Dr. Philip Rocco is the department chair and associate professor in Marquette's political science department. He told us, "The only question is how long it will last."

Rocco says, typically, budget battles are over government funding and the funding bill. But this shutdown is different.

On the surface, it's over health care: Affordable Care Act tax credits are set to expire at the end of the year. Republicans want them to expire; Democrats are fighting to permanently extend

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