Reuters/Ipsos: Romney, un front-runner vulnerable

Encuesta de Reuters/Ipsos:

Romney, a former Massachusetts governor, is holding on to his support but failing to increase it significantly, according to the survey, which also showed President Barack Obama facing deep unhappiness among voters about his performance.

Romney was backed by 23 percent of Republicans in the October poll, up from 20 percent in the most recent comparable Reuters/Ipsos poll carried out in June.

Cain, a businessman who has emerged as a surprise front-runner after proposing a radical tax reform, nearly tripled his support among Republicans in the same period, leaping to 19 percent from 7 percent four months ago.

"In the Republican presidential primary, everybody still says Mitt Romney's the front-runner," Ipsos research director Chris Jackson said. "And he is ... but he's certainly not any sort of dominant front-runner."

Texas congressman Ron Paul was third with 13 percent and Texas Governor Rick Perry fourth, with 10 percent.