- Winner
- Donald Trump
- Primary date
- May 10, 2016
Poll source | Date | 1st | 2nd | 3rd | Other | Primary results | May 10, 2016 | Donald Trump 77.01% | Ted Cruz 8.98% | John Kasich 6.74% | Ben Carson 2.17%, Marco Rubio 1.43%, Jeb Bush 1.14%, Rand Paul 0.89%, Mike Huckabee 0.87%, Chris Christie 0.36%, Carly Fiorina 0.33% | R.L. Repass & Partners/MetroNews[1] Margin of error: ± 4% Sample size: 228 | April 22– May 2, 2016 | Donald Trump 57% | Ted Cruz 25% | John Kasich 14% | Undecided 4% | Public Policy Polling[2] Margin of error: ± 4.2% Sample size: 549 | April 29– May 1, 2016 | Donald Trump 61% | Ted Cruz 22% | John Kasich 14% | Undecided 3% | Metro News[3] Margin of error: ± ?% Sample size: 159 | February 11–16, 2016 | Donald Trump 40% | Ted Cruz 20% | Marco Rubio 15% | Ben Carson 10%, John Kasich 6%, Jeb Bush 4%, Carly Fiorina <1%, Chris Christie <1%, Not Sure 4% | Orion Strategies Margin of error: ± 4.9% Sample size: 406 | August 25, 2015 | Donald Trump 29% | Marco Rubio 8% | Ben Carson 7% | Jeb Bush 7%, Mike Huckabee 7%, Ted Cruz 5%, Scott Walker 2%, Carly Fiorina 2%, John Kasich 1%, Rand Paul 1%, Undecided 32% | Harper Polling Archived 2015-07-09 at the Wayback Machine Margin of error: ± 6.3% Sample size: 242 | April 9–11, 2015 | Jeb Bush 23% | Mike Huckabee 20% | Scott Walker 13% | Ben Carson 8%, Ted Cruz 8%, Rand Paul 7%, Chris Christie 5%, Marco Rubio 4%, Rick Santorum 1%, Undecided 11% | |