President Barack Obama, House Speaker Nancy Pelosi and Senate Majority Leader Harry Reid will be all smiles as the president arrives at the Capitol for his State of the Union speech Wednesday night, but the happy faces can’t hide relationships that are fraying and fraught.

The anger is most palpable in the House, where Pelosi and her allies believe Obama’s reluctance to stake his political capital on health care reform in mid-2009 contributed to the near collapse of negotiations now.

But sources say there are also signs of strain between Reid and White House chief of staff Rahm Emanuel, and relations between Democrats in the House and Democrats in the Senate are hovering between thinly veiled disdain and outright hostility.

In a display of contempt unfathomable in the feel-good days after Obama’s Inauguration, freshman Rep. Dina Titus (D-Nev.) stood up at a meeting with Pelosi last week to declare: “Reid is done; he’s going to lose” in November, according to three people who were in the room.

Titus denied Tuesday evening that she had singled out Reid, but she acknowledged that she said Democrats would be “finished” if they failed to heed the lessons of Massachusetts, where Republican Scott Brown won Ted Kennedy’s Senate seat last week.

House Majority Whip Jim Clyburn (D-S.C.), a Pelosi ally, took his shots at the Senate on Fox radio Tuesday, describing the Senate as the “House of Lords” and accusing senators of failing to “understand that those of us that go out there every two years stay in touch with the American people.”

On Tuesday, House Majority Leader Steny Hoyer (D-Md.) told reporters the legislative process in the Senate is “broken” — prompting Reid to later quip: “I could give you a few comments on how I feel about the House.”

Pelosi and her allies blame the collapsing health reform negotiations, in part, on Obama’s reluctance to sacrifice political capital to seal a final deal in mid-2009. House Democrats also resent that Emanuel and other White House officials forced them to take tough votes on cap and trade and health reform while allowing Reid and Senate Democrats months of fruitless frittering on the details.

In recent days, Pelosi and her team have struck a new, tougher tone with the White House, resisting pressure to quickly accept the Senate’s health bill, even with assurances that it would later be altered.

House Democratic leaders were equally unimpressed by Obama’s vow to review his political operation and enlist 2008 campaign manager David Plouffe to help them stave off disaster in the midterm elections.

Democrats say they’ve been completely focused on the danger of a populist backlash for months. One retiring Democrat — Rep. Marion Berry of Arkansas — told his local paper that Obama dismissed his concerns in a private meeting by saying the party would avoid a 1994-type debacle because of Obama’s personal popularity.

“The president himself, when that was brought up in one group, said, ‘Well, the big difference here and in ’94 was you’ve got me,’” Berry told the Arkansas Democrat-Gazette. “We’re going to see how much difference that makes now.”

For their part, Pelosi and Reid remain on good terms personally, aides to both said.

And if there’s any consolation for Obama, Pelosi and Reid, it’s that the bonfire of their expectations seems to illuminate the general path ahead: Dispense with health care as quickly as possible to focus on job creation and deficit reduction.

“They understand that tearing each other down is going to tear the whole party down,” said a senior House Democratic aide.

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