What's behind the Trump Bump? A disgruntled GOP electorate

Donald Trump's so-far durable support in the Republican race for the presidential nomination rests largely on widespread dissatisfaction with Washington, and has been bolstered by his vocal criticism of the country's immigration policies.

A new CNN/ORC Poll finds that just 30% of registered voters nationwide say they feel their views are well represented by the government in Washington, while 40% say they are not represented well at all. That figure spikes among Republican and Republican-leaning voters. Among GOP voters, 53% say they don't feel their views are well represented in Washington at all, nearly double the 27% of Democrats and Democratic-leaning independents who feel the same way.

Read the full CNN / ORC poll results

And these Republican voters who say their views are not represented at all by the government in Washington are far more likely than other Republicans to back Trump's run for the White House. Among this group, Trump holds a broad lead: 24% support him vs. 13% behind former Florida governor Jeb Bush, with the rest of the field at 8% or less. These disaffected voters are more likely to say they want Trump to stay in the race (58% vs. 45% among other Republicans) and more likely to think he will ultimately win the party's nomination: 27% say Trump will, 29% Bush. Among other Republican registered voters, those figures are 34% Bush and 18% Trump.

The disaffected are slightly more likely to cite illegal immigration as their top issue in deciding whom to support for president next year (14% compared with 7% among other Republicans), but in both groups, the economy is the dominant issue, cited as tops by more than 4 in 10 voters.

Although these voters say they feel left out of Washington's political process, they are more likely than other Republicans to say they are "extremely enthusiastic" about voting for president next year, 31% compared with 23% among other Republican registered voters. They are also slightly less satisfied with the field of Republican candidates (29% say they are dissatisfied compared with 22% among other Republican voters).