A growing number of Democrats are threatening to defy the White House over the national debt, joining Republican calls for deficit cuts as a requirement for consenting to lift the country’s borrowing limit.

The tension is the latest illustration of how the tea-party-infused GOP is driving the debate in Washington over federal spending. And it shows how the debt issue is testing the Obama administration’s clout as Democrats, particularly those from politically competitive states, resist White House arguments against setting conditions on legislation to raise the debt ceiling.

The push-back has come in recent days from Sens. Kent Conrad (D-N.D.), chairman of the Senate Budget Committee, and Joe Manchin (D-W.Va.), a freshman who is running for reelection next year. Sen. Mark Pryor (D-Ark.) told constituents during the Easter recess that he would not vote to lift the debt limit without a “real and meaningful commitment to debt reduction.”

And although many lawmakers and aides say a bipartisan deal is likely, the insistence on conditions by a small but pivotal group of Democrats suggests that any agreement would almost certainly have to include substantial cuts in the deficit — not just to mollify House Republicans but to satisfy Democrats who could be politically vulnerable on spending issues.

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