Former Minnesota Gov. Tim Pawlenty, Mississippi Gov. Haley Barbour, Ambassador to China Jon Huntsman, former Sen. Rick Santorum (R-Pa.) and former New Mexico Gov. Gary Johnson all come in under 5 percent in the poll.

Real estate mogul Donald TrumpDonald TrumpFormer defense secretary Esper sues Pentagon in memoir dispute Biden celebrates start of Hanukkah Fauci says lies, threats are 'noise' MORE, meanwhile, was volunteered as a choice by enough respondents to garner 1 percent in the Gallup poll.

The poll surveyed 1,082 Republicans and Republican-leaning independents and has a margin of error of plus or minus 4 percentage points.

So far, Pawlenty is the only top-tier Republican to officially form a presidential exploratory committee. Romney and Gingrich are widely expected to follow him into the race. 

Bachmann is leaning toward a 2012 run and will form an exploratory committee by June at the latest if she decides to get in.