The Republican establishment has denounced Donald Trump so much so that only the 1912 election – when angered Theodore Roosevelt supporters left the National Convention after Howard Taft’s nomination – comes close. However, “only about a half-dozen GOP senators backed Roosevelt, and less than 15 percent of the convention delegates bolted with him,” Cowan told the Atlantic. Meanwhile, according to the article, nearly one-third of Republican Senators and Governors have stated they will not vote for Trump.