As I did previously for Jon M. Huntsman, Jr., I looked at the second-place choices of Mr. Perry’s voters as reported by Public Policy Polling in the surveys it has conducted since Christmas. About 500 of Mr. Perry’s supporters were interviewed during this period in polls of Iowa, New Hampshire, South Carolina, Florida, North Carolina and Texas.

Among these voters, second-place support was about evenly divided among three candidates: Mr. Gingrich was listed by 22 percent of Mr. Perry’s supporters as their second choice, but Rick Santorum and Mitt Romney were each listed as the second choice by 20 percent of Mr. Perry’s voters. Ron Paul had the support of 12 percent, while 26 percent picked another candidate or were undecided.