Americans are “fed up” with politics, suspect the wealthy are getting an unfair edge, and think the country is going in the wrong direction, according to a new Bloomberg Politics poll that lays bare the depth and breadth of the discontents propelling outsider candidates in the Republican presidential field.

The survey shows that 72 percent of Americans think their country isn't as great as it once was—a central theme of front-runner Donald Trump's campaign. More than a third prefer a presidential candidate without experience in public office.

Three of the four candidates leading the Republican field fit that description: Trump, the first choice of 21 percent of registered Republicans and voters who say they lean that way, followed by neurosurgeon Ben Carson with 16 percent, former Florida Governor Jeb Bush with 13 percent, and former Hewlett-Packard CEO Carly Fiorina with 11 percent.