Seven in 10 Republican primary voters want a candidate who will shake up the system, and their top choice for the nomination is Donald Trump. Just one in four want someone who will work within the system.

Donald Trump is also seen as most likely to get things done in Washington, far outpacing his rivals on this measure.

Trump trails Cruz and Rubio on sharing the values of Republican primary voters and on having realistic policies, but half still think he is prepared to be president, and he is widely seen as the most electable candidate of the field. He rates higher than Cruz or Rubio on handling the economy and an international crisis.