McCain's claims about ACORN are false, and he's just using the situation to drum up hard feelings in the Republican base. You can read an excellent AP article about the ACORN situation and McCain's false claims here and here.
So McCain has made a lot of false charges using very strong language, so what? Where's the harm? McCain's lie has already led to violence:
Police in Caledonia [Wisconsin] are investigating the assault of a campaign volunteer as she was canvassing for Senator Barack Obama Saturday afternoon.This man was misled by John McCain and clearly became extremely upset. This man will probably face criminal charges for his actions, but who will hold John McCain accountable for putting this lie in circulation?
In an exclusive interview with 12 News, 58 year-old Nancy Takehara of Chicago says she was going door-to-door when she came across a disgruntled homeowner.
"The next thing I know he's telling us we're not his people, we're probably with ACORN, and he started screaming and raving," Takehara said. "He grabbed me by the back of the neck. I thought he was going to rip my hair out of my head. He was pounding on my head and screaming. The man terrified me."
The man eventually stopped and the Caledonia police were called. Takehara was asked if she needed medical assistance, but she was not seriously injured. Instead, she says she was shaken up by the homeowner's reaction.
"This negative stuff has to stop," said Takehara. "We're all Americans. This is all about protecting our democracy, not about attacking each other."