Part two of the health care reform law has passed Congress, sending final fixes to the historic legislation to President Obama's desk for signature.

Obama was speaking in Iowa when the Senate approved the changes in a 56-43 vote. A few hours later, the House had also passed the revisions, 220-207.

However, what seems like the final chapter in a year-long debate over universal health care could be just the beginning. GOP leaders have promised to repeal the law in the upcoming mid-term elections.

Confident their attempts will fail, Obama responded, "I welcome that fight."

Protests against the health care legislation were growing in Iowa City, where Obama celebrated the bill's passage, Thursday.

Americans Divided

A USA Today-Gallup Poll shows many Americans are divided over health care reform.

• 40 percent think the bill's passage is a bad thing.
• 49 percent said it's a good thing.
• 11 percent had no opinion.

The majority of those polled were split down party lines. The division has given rise to anger in some cases.

More than 10 Democratic House members have stepped up security after a series of threats and incidents targeting those who voted for health care reform.

"Your antenna just has to go up until you figure out the capability," former FBI agent Brad Garrett said. "Is this just someone blowing off steam inappropriately, or do they actually really want to do something?"

Democrats point the finger of blame at Republicans.

Threatening Rhetoric

"When people start talking in the rhetoric of putting people on firing lines or they put a target on their faces, with cross-hairs -- that activity ought to be unacceptable in our democracy," said Rep. Steny Hoyer, D-Md.

However, Republicans have been quick to speak out against the threats.

"I know there is anger, but let's take that anger, and go out and register people to vote, go volunteer on a political campaign, and let's do it the right way," said Rep. John Boehner, R-Ohio.

Former Massachusetts Gov. Mitt Romney's political action committee has announced One Way -- a new donation program that will give campaign money to candidates who pledge to repeal what he calls, "the worst aspects of Obamacare."

"In the president's health care plan if you will, it's like maraschino cherries on top of a big pile of dirt," Romney said. "There are some cherries in there, and I'm happy with those things."

"But the other parts that are not so happy," he added. "Those worst aspects of the Obamacare plan have to be repealed."