The poll of 800 likely voters -- conducted by the Anderson Group, a Republican firm -- has Jindal ahead of Blanco by 7 points, with 21 percent of the electorate saying they were undecided.
Jindal, a former state and Bush administration official, was the choice of 43 percent of the voters surveyed, while 36 percent said they were for Blanco. The poll has a margin of error of plus or minus 3.4 percent
In the Oct. 4 open primary, in which all candidates run against each other regardless of party, Jindal led the field with 33 percent of the vote. Blanco was in second place at 18 percent, narrowly edging veteran state Attorney General Richard Ieyoub.
The runoff election will be held Nov. 15. Incumbent Gov. Mike Foster is leaving office after eight years as governor.