The national survey shows the Peruvian Nationalist Party leader is favored by 22 percent of those polled, twice the support he had only a month earlier.
The new figure puts Ollanta Humala in a statistical tie with frontrunner Lourdes Flores, a former congresswoman whose support in the poll was 25 percent.
However, the poll also shows that Ms. Flores would still win in a run off.
Ollanta Humala's surge is attributed to his nationalistic vision that would focus on fighting corruption.
Peru's election is scheduled for April.
Some information for this report provided by Reuters and AP.