Senator John McCain, who refused to make President Obama’s association with the Rev. Jeremiah A. Wright an issue during his 2008 presidential campaign, repudiated a proposal by Republican strategists to “do exactly what John McCain would not let us do” — open an incendiary, racially tinged attack on the president. Mr. McCain also shrugged off the slights against him in a proposal for the political ad campaign, which was brought to light by The New York Times. “I don’t know whether to be offended or not,” Mr. McCain said with a smile. “It is what it is. Look, my life...