The Republicans are out of ammunition. The only thing they have left to talk about is William Ayers, who sat on the board of Chicago Annenberg project and the Woods Fund with Obama. Ayers hosted a coffee during Obama's first campaign. Obama read a book that Ayers wrote, and Ayers donated $200 to one of Obama's re-election campaign. Obama was only eight years old when Ayers was with the Weather Underground.
Radio talk show host and convicted felon G. Gordon Liddy is much more notorious terrorist than William Ayers. He says that he admires Adolf Hitler. He served more than four years in prison for his role in the Watergate break-in and the Daniel Ellsberg case. He has admitted that he plotted to murder journalist Jack Anderson; plotted to murder fellow Republican operative E. Howard Hunt; and plotted to firebomb the Brookings Institution. Liddy also reportedly gave advice on how to shoot agents of the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) and reportedly admitted to naming shooting targets after the Clintons. He held a fund-raiser for McCain in 1998, and has donated at least $5,000 to McCain's campaigns since then. McCain has praised and repeatedly associated with Liddy in public and in campaign settings.
Here's a story from the Huffington Post with more details on this, as well as McCain's support for another terrorist group, the Contras in Nicaragua: John McCain's terrorist connections.