Here is the result of the April 25-27 Pulse Asia survey:
source: Pulse Asia website
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Here is the result of the pulse asia pre election survey from April 3-5:

image source: Pulse Asia website
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Here is the result of the survey:

LEGARDA Loren
LACSON, Panfilo “Ping” M.
PANGILINAN, Francis “Kiko” N.
ESCUDERO, Francis “Chiz” G.
RECTO, Ralph G.
VILLAR, Manuel “Manny” Jr. B.

Here is the result of the Pulse Asia Survey:

These images are taken from Pulse Asia Website

T0p 15 senatorial candidates as of January 2007:

Loren Legarda
Senators Panfilo M. Lacson and Francis N. Pangilinan
Taguig-Pateros Representative Alan Peter S. Cayetano
Former Senator Vicente C. Sotto III
Senate President Manuel B. Villar, Jr
Senator Ralph G. Recto
Senator Joker [...]

Pulse Asia’s November 2006 Ulat ng Bayan Survey reveals the most likely winners to the 2007 Philippine senatorial race. The survey conducted from October 21- November 8 last year revealed that Loren Legarda, who lost the Vice President seat to Noli de Castro during the 2003 election, tops the list of Filipino senatorial bets.
Other senatorial [...]