Aides to the G.O.P. front-runner, Donald Trump, expressed concern on Friday that New Jersey Governor Chris Christies endorsement of their candidate might overshadow equally impressive words of praise that Trump received yesterday from the former Ku Klux Klan leader David Duke. The scheduling of Christies endorsement just one day after the K.K.K. luminarys boost was obviously far from ideal, the Trump aide Harland Dorrinson said. In a perfect world, youd like some daylight between Christies endorsement and Dukes statement of support, so theyd each have maximum impact, he said. As major as the Christie news is, we wouldnt want the Duke thing to get lost in the shuffle. The aide said that the events of the past twenty-four hours have been dizzying. When the Christie thing happened, we were still celebrating the David Duke thing, he said. Its been crazy. Dorrinson said that the Trump campaign expects an avalanche of endorsements from G.O.P. leaders, white supremacists, and neo-Nazis in the days and weeks ahead. Sure, thats going to cause scheduling problems, he said. But those are the kinds of problems every campaign would love to have. 