WASHINGTON (CNN) - Republicans launched an enormous wave of phone calls Thursday blasting Barack Obama for "having worked closely with domestic terrorist Bill Ayers," party sources said.
The calls are part of a $70 million last Republican push to get out the vote for John McCain on November 4, using calls, mailings and door-knocking in battleground states.
"Hundreds of thousands" of calls are being made in at least half a dozen hard-fought states including Virginia, North Carolina and Ohio, the sources said.
Some are recorded "robocalls," while others are live to comply with relevant state laws. The calls are being paid for jointly by the Republican party and the McCain campaign, according to a script provided by the Republican party.
The "robocalls" criticize Obama national security, his opposition to an Illinois measure that called for doctors to provide medical care to babies who survive botched abortions, his connection with former '60s radical William Ayers and his response to the financial crisis.
An Obama spokesman said the "dishonorable, dishonest" calls were a desperate move.
"John McCain's campaign has admitted that the economy is a losing issue for them, so he's chosen to launch dishonorable and dishonest attacks like this," Obama national spokesman Bill Burton said.
The calls come a day after McCain and Obama accused each other of running negative campaigns.
Republicans have been hammering Obama for weeks for his association with Ayers, a key figure in the Weather Underground of the Vietnam War era. The radical group took credit for a number of bombings, including of the Pentagon. A case against Ayers was thrown out of court because of misconduct by investigators. He is now an education professor in Chicago and has served on a board with Obama.
McCain said he did not care about "an old washed-up terrorist" like Ayers Wednesday night at his debate with Obama.
Obama condemned Ayers' actions of 40 years ago, and said the former radical was not involved in his campaign and would not advise him as president.
(Script of the call after the jump)
Here is the text of the call referring to Ayers:
"Hello. I'm calling for John McCain and the RNC (Republican National Committee) because you need to know that Barack Obama has worked closely with domestic terrorist Bill Ayres, whose organization bombed the U.S. Capitol, the Pentagon, a judge's home and killed Americans. And Democrats will enact an extreme leftist agenda if they take control of Washington. Barack Obama and his Democratic allies lack the judgment to lead our country. This call was paid for by McCain-Palin 2008 and the Republican National Committee at 202-863-8500."
The only deaths positively attributed to Weathermen bombs were three members of the group itself who were killed when a bomb they were working on exploded prematurely. The Weathermen, along with the Black Panther organization, were investigated for another bombing that killed a San Francisco police officer, but that bombing remains unsolved.
The son of a New York State supreme court justice says that the Weathermen were also responsible for a bomb at his father's home in February 1970, basing his claim on a letter from Weather Underground member Bernadine Dohrn (Ayers' wife) sent to the Associated Press in November promising more bombings. Investigators, however, believe that letter was referring to the bombing of a New York courthouse in October.
The Weathermen claimed responsibility for the courthouse bombing, as they did other bombings attributed to them. No one claimed responsibility for the bombing of the judge's home, and the the case was never solved.
–CNN Senior Political Correspondent Candy Crowley contributed to this report.