(CNN) -- With recent polls showing Sen. Barack Obama's lead increasing nationwide and in several GOP-leaning states, some Republicans attending John McCain-Sarah Palin campaign rallies are showing a new emotion: rage.
An angry supporter confronts Sen. John McCain at a rally in Wisconsin on Thursday.
At a rally in Minnesota on Friday, a woman told McCain: "I don't trust Obama. I have read about him and he's an Arab."
McCain shook his head and said, "No ma'am, no ma'am. He's a decent family man...[a] citizen that I just happen to have disagreements with on fundamental issues. That's what this campaign is all about."
One man at the rally said he was "scared of an Obama presidency." McCain later told the man he should not fear Obama.
"I want to be president of the United States, and I don't want Obama to be," he said. "But I have to tell you, I have to tell you, he is a decent person, and a person that you do not have to be scared as President of the United States."
McCain's response was met with boos from the crowd.
When asked about these outbursts, McCain campaign manager Rick Davis said that he didn't know who those people were and if they were there as supporters or to disrupt the rallies.
A day earlier, the same type of hostility toward Obama was evident at McCain-Palin rallies.
"When you have an Obama, [House Speaker Nancy] Pelosi and the rest of the hooligans up there going to run this country, we have got to have our head examined. It's time that you two are representing us, and we are mad. So, go get them," one man told McCain at a town hall meeting in Waukesha, Wisconsin.
Another man was more pointed.
"And we're all wondering why that Obama is where he's at, how he got here. I mean, everybody in this room is stunned that we're in this position," another man said at Thursday's rally.
"I'm mad. I'm really mad. And what's going to surprise you, it's not the economy. It's the socialists taking over our country," one said. Watch more of the anger at the rallies »
McCain urged his supporters to be respectful of Obama.
"We want to fight and I will fight. But we will be respectful," he said. "I admire Sen. Obama and his accomplishments. I will respect him and I want everyone to be respectful, and let's make sure we are." Watch McCain address attacks on Obama »
CNN contributor David Gergen, who has advised Democratic and Republican presidential administrations, said Thursday that the negative tone of these rallies is "incendiary" and could lead to violence.
"There is this free floating sort of whipping around anger that could really lead to some violence. I think we're not far from that," he said. "I think it's really imperative that the candidates try to calm people down."
On Friday, Obama said the "barrage of nasty insinuations and attacks" was a result of the Republican nominee's failed economic ideas.
"They can run misleading ads, they can pursue the politics of anything goes. It will not work. Not this time. I think that folks are looking for something different this time. It's easy to rile up a crowd, nothing's easier than riling up a crowd by stoking anger and division. But that's not what we need right now in the United States. The times are too serious," Obama said at a rally in Chillicothe, Ohio.
Recently, McCain's campaign launched a string of ads that question Obama's judgment and character.
The McCain campaign calls Obama "too risky for America" in a new Web ad that focuses on his political relationship with Bill Ayers, a founding member of the radical Weather Underground.
"Barack Obama and domestic terrorist Bill Ayers. Friends. They've worked together for years. But Obama tries to hide it," the announcer said in the 90-second ad.
The now-defunct Weather Underground was involved in bombings in the early 1970s, including attacks on the Pentagon and the Capitol. Obama was a young child at the time of the bombings.
Obama and Ayers, now a university professor, met in 1995, when both worked with a nonprofit group trying to raise funds for a school improvement project and a charitable foundation. CNN's review of project records found nothing to suggest anything inappropriate in the volunteer projects in which the two men were involved. CNN Fact Check: Is Obama 'palling around with terrorists'?
Obama, in an April debate during the primaries, called Ayers "somebody who engaged in detestable acts 40 years ago, when I was 8."
At a rally Tuesday in Clearwater, Florida, Sarah Palin said Obama was being "less than truthful" about his ties to Ayers. "His own top adviser said they were 'certainly friendly.' ... I am just so fearful that this is not a man who sees America the way that you and I see America -- as the greatest source for good in this world," she said.
Palin told the crowd that she sees "a pattern in how our opponent has talked about one of his most troubling associations." Watch more of Palin's comments »
One member of the Palin audience in Jacksonville, Florida, Tuesday shouted out "treason." And at another rally in the state Monday, Palin's mention of the Obama-Ayers tie caused one member to yell out: "kill him" -- though it was unclear if it was targeted at Obama or Ayers.
At several recent rallies, Palin has stirred up crowds by mentioning the "liberal media." Routinely, there are boos at every mention of The New York Times and the "mainstream media," both of which are staples of Palin's stump speech.
Some audience members are openly hostile to members of the traveling press covering Palin; one crowd member hurled a racial epithet at an African-American member of the press in Clearwater, Florida, on Monday.
And at a McCain rally in New Mexico on Monday, one supporter yelled out "terrorist" when McCain asked, "Who is the real Barack Obama?" McCain didn't respond. Watch as McCain ramps up his criticism of Obama »
Ohio Gov. Ted Strickland, a Democrat, on Friday told voters that the McCain-Palin campaign "would want you to be afraid of Barack Obama."
Some Republicans have also been critical of the McCain campaign.
Former Michigan Gov. William Milliken, a Republican, told the Grand Rapids Press he was "disappointed in the tenor and the personal attacks on the part of the McCain campaign."
"He is not the McCain I endorsed," Milliken said Thursday.
Some anger found at McCain-Palin rallies is directed at McCain for a different reason. Watch analysts weigh in on the recent attacks »
"I am begging you, sir, I am begging you, take it to him," another supporter said to the Arizona senator at the Wisconsin rally.
McCain, however, seems torn. On one hand, he is going negative on the Ayers controversy.
"The point is, Sen. Obama said he was just a guy in the neighborhood. We know that's not true," he said at the rally in Wisconsin. "We need to know the full extent of the relationship because of whether Sen. Obama is telling the truth to the American people or not."
On the other hand, McCain is trying to focus on the economic downturn plaguing the country.
"But I also, my friends, want to address the greatest financial challenge of our lifetime with a positive plan for action," he added.
Also, the McCains said months ago they didn't want their son Jimmy -- a Marine serving in Iraq -- dragged into the campaign.
But on Thursday, Cindy McCain brought up her son.
She criticized the Illinois senator for voting against a bill to fund troops in Iraq, a regular line of attack from her husband's campaign.
"The day that Sen. Obama cast a vote not to fund my son when he was serving sent a cold chill through my body, let me tell you," she told a Pennsylvania crowd before introducing her husband and his No. 2.
The vote Cindy McCain is referencing came in May 2007, when Obama was one of 14 senators who voted against a war-spending plan that would have provided emergency funds for American troops overseas.
A CNN fact check deemed the charge that Obama voted against troop funding "misleading." Obama supported a different version of the troop-funding plan -- one that McCain spoke against. Fact Check: Did Obama vote to cut funds for the troops?
CNN's Carey Bodenheimer, Dana Bash and Anastasia Diakides contributed to this article.
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