WASHINGTON - (KRT) - Mark McKinnon, the Austin political consultant who oversaw the advertising for President Bush in the 2000 and 2004 campaigns, has committed to help Sen. John McCain in a second presidential bid. McKinnon - one of the president's closest friends and confidants and a frequent mountain biking companion - met with the Arizona Republican over lunch this spring in the Senate dining room to discuss his support, said a GOP activist familiar with the meeting. At this point, McCain, who lost to Bush in a bitter 2000 Republican primary, is in the early but unmistakable stages of...