Democratic presidential candidate Barack Obama says he’ll push for vote after vote until the U.S. House and Senate override President Bush’s veto and set a date for withdrawal of troops from Iraq.

Obama, a U.S. Senator from Illinois, campaigned in Iowa Sunday and spoke at a Baptist church in Waterloo. "Over 3300 young men and women aren’t coming home. We’re spending $275 million a day in Iraq. Imagine if we spent $275 million right here in Waterloo," Obama said, as the congregation’s pianist accompanied his words with running chords.

Some in the congregation clapped. Others said "Amen" to Obama’s words. 

Democrats face an uphill battle if they plan to override Bush’s veto of an Iraq spending plan that includes a timeline for withdrawal, as they have to convince some Republican members of the U.S. Senate to join with them in order to get enough votes to override Bush’s veto. "And I’m out there trying to gather those 16 votes, but I have to tell you if I don’t get those 16 votes before I’m president, as president I will bring our young men and women home," Obama told the crowd of about 300, as some clapped and one woman yelled "All right!"

Obama urged his Iowa audience to start lobbying Republican Senator Charles Grassley to vote for legislation that includes a withdrawal plan for Iraq.

Earlier this spring, Obama told the Associated Press he did not think congress would "play chicken" with Iraq funding if President Bush vetoed a bill which set a timeline for withdrawal.

Democratic presidential candidate Joe Biden says the war in Iraq is standing in the way of the progress on challenges here at home.

"Iraq is sort of like a big boulder sitting in the middle of the road. In order to regain our flexibility domestically to deal with health care, to deal with global warming, to deal with the environment generally, to deal with energy, to deal with education — you need to end this war," Biden says. "We’re spending $100 billion a year on this war."

Biden, a six-term U.S. Senator from Delaware, says the only way to resolve the complexities of Iraq is to find a political solution and he asserts his rivals don’t offer the kind of specifics he does.  "They’ll say, ‘Well, what I’m going to do is I’m going to start to remove troops’ or ‘I think we should change the mission.’ Then ask them a two word question: ‘Senator, Governor — then what?’ and see what they answer," Biden says. "There is no solution that’s military. It’s a political solution and the only way you can do it is the only way it’s ever happened peacefully in history. You’ve got to give the parties breathing room, separate them, a decentralized government giving them control over the fabric of their daily lives. Absent that, you can’t do it."

Biden is the chairman of the Senate Foreign Relations Committee. He spoke this weekend at the Iowa Broadcast News Association convention in Clear Lake.