Larry Jacobs, political science professor at the University of Minnesota, said Mr. Trump cannot rely on personality alone to drive him to victory in a general election campaign, and said he is starting out well behind Mr. Romney and, to a lesser extent, Mr. McCain when it comes to developing the sort of campaign operation needed to win a race for The White House in the modern era.
"What happens during the general election?" he said. "There is growing angst among Republican officeholder [as to] what this means. Senate races, statehouse races, these all are going to be impacted if you have a divisive candidate atop the ticket that discourages old-time Republican voters to sit it out."