Democrats are making increasingly explicit threats about their willingness to let nearly $600 billion worth of tax hikes and spending cuts take effect in January unless Republicans drop their opposition to higher taxes for the nation’s wealthiest households.

Emboldened by signs that GOP resistance to new taxes may be weakening, senior Democrats say they are prepared to weather a fiscal event that could plunge the nation back into recession if the new year arrives without an acceptable compromise.

In a speech Monday, Sen. Patty Murray (Wash.), the Senate’s No. 4 Democrat and the leader of the caucus’s campaign arm, plans to make the clearest case yet for going over what some have called the “fiscal cliff.”

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