The McCain campaign, in a continuing effort to link Barack Obama to domestic terrorism, released a statement Wednesday from a New York supporter, recounting how his family home was firebombed by the radical 1960s group founded by Obama supporter William Ayers. But the McCain supporter, John M. Murtagh, has his own ties to radical protesters: He served as a lawyer for a Catholic priest who led protests at an abortion clinic that turned violent. Mr. Murtagh embarked on a media campaign in the spring to publicize the 1970 firebombing of his family home by the Weather Underground, the group that...