(CNN) -- As a spending bill loaded with pork makes its way through Congress, President Obama is getting pushback from members of his own party who are questioning his vow to end wasteful spending.



The Senate could vote on the spending bill as early as Thursday.



The president on Wednesday pledged turn tide on an "era of fiscal irresponsibility," reiterating his campaign promise that the days of "pork ... as a strategy" are over.



And in a prime-time address before a joint session of Congress, Obama last week praised the $787 billion stimulus package signed into law, telling the nation, "I'm proud that we passed a recovery plan free of earmarks, and I want to pass a budget next year that ensures that each dollar we spend reflects only our most important national priorities."



But some in the audience found that hard to swallow.



"There was just a roar of laughter -- because there were earmarks," said Sen. Claire McCaskill, D-Missouri.



Earmarks, sometimes called "pork," are unrelated pet projects that members of Congress insert in spending bills.  Watch more on the earmarks in the bill »



The scoffing continues as the president hammers away at reducing wasteful spending and saving taxpayers money while lawmakers on Capitol Hill load up a spending bill with more than 8,000 earmarks totaling nearly $8 billion.



The legislation in question is a $410 billion omnibus bill that would keep the federal government running through the rest of the fiscal year, which ends in September 2009.



According to Taxpayers for Common Sense, a group that monitors government spending, the bill includes:



About 60 percent of the earmarks are from Democrats, and about 40 percent are from Republicans, according to Taxpayers for Common Sense.



Ryan Alexander, the president of the Taxpayers for Common Sense, pointed out that not all earmarks are bad.



"They're not always good or bad. What's bad is the process. We don't know why certain projects get earmark funds and why other projects don't. Some of them may be good. But that could be just as well by accident as it is by design, because we have no idea why these projects are funded and why other projects aren't," he said.



Earlier this week, 14 Democratic senators met to talk about their concerns with the spending. On Wednesday, Democratic Sens. Evan Bayh and Russ Feingold called on Obama to veto the bill.  Watch Feingold talk about a 'teary-eyed' defense of earmarks »



"But the bloated omnibus requires sacrifice from no one, least of all the government. It only exacerbates the problem and hastens the day of reckoning," Bayh wrote in a Wall Street Journal editorial published Wednesday.



Democrats blocked amendments by Sens. John McCain, R-Arizona, and Tom Coburn, R-Oklahoma, that would have narrowed the spending on earmarks.



"So much for the promise of change. This may be -- in all the years I have been coming to this floor to complain about the earmark pork barrel corruption that this system has bred, this may be probably the worst, probably the worst," McCain said Tuesday.



The spending bill made it through the House last week. A vote in the Senate could come as early as Thursday, but it's unclear if there are the 60 votes necessary to sent it to the floor since some Democrats aren't supporting it.



Obama is expected to sign the bill when it reaches his desk.



But Democrats speaking out against the pork could just be flexing their muscles, said CNN contributor Roland Martin.



"I would love to see these same Democrats have the courage to actually stand up, look their fellow senators in the eye, Democrats and Republicans, and say, OK, let's get rid of your particular project," he said.



"What often happens in Congress is, they complain in terms of the general ... What I am saying is, call them out. Put it on the table," he said.



Those defending the earmarks say they make
What is the amount of the spending bill? When could Senate vote on the bill? Who want Obama to veto bill? How much is the spending for bill FY 2009? How many earmarks does the spending bill include? Percentage of earmarks on bill? Who want's Obama to veto the bill?
$410 billion as early as Thursday. Democratic Sens. Evan Bayh and Russ Feingold $410 billion 8,000 60 percent Evan Bayh and Russ Feingold
question: What is the amount of the spending bill?, answer: $410 billion | question: When could Senate vote on the bill?, answer: as early as Thursday. | question: Who want Obama to veto bill?, answer: Democratic Sens. Evan Bayh and Russ Feingold | question: How much is the spending for bill FY 2009?, answer: $410 billion | question: How many earmarks does the spending bill include?, answer: 8,000 | question: Percentage of earmarks on bill?, answer: 60 percent | question: Who want's Obama to veto the bill?, answer: Evan Bayh and Russ Feingold