* Fujimori closes gap with first-round winner Humala
* Nearly a fifth of voters undecided, planning to abstain
(Updates with poll details, context)
LIMA May 7 Peru's left-wing nationalist
Ollanta Humala and right-wing lawmaker Keiko Fujimori are
running almost neck-and-neck ahead of a June 5 presidential
run-off election, a poll by Lima's Catholic University showed
The nationwide poll showed 40.7 percent of voters backed
Humala while 40.5 percent supported Fujimori, with 18.7 percent
of respondents still undecided or saying they would not vote
Both candidates are courting moderate voters, who political
analysts say will decide the election.
Peru's stock index .IGRA gained 10.88 percent last week
after three other polls also said Fujimori, who has a graduate
business degree from Columbia University in New York, had
gained to a virtual tie.
Humala, a former army officer, campaigns as a moderate in
favor of free market economic policies in the style of former
Brazilian President Luis Inacio Lula da Silva, but he has faced
mounting skepticism for discrepancies in his public statements
and his official campaign platform.
Most recently, he pledged not to touch Peru's $30 billion
in privately run pension funds. [ID:nN05183936]
Fujimori, 35, has closed the gap in polls since finishing 8
points behind Humala in the first-round vote on April 10 as she
tries to distance herself from her father, jailed former
President Albert Fujimori.
But many Peruvians have not forgiven her father for
corruption and human rights abuses that marred the end of his
Saturday's poll of 1,570 people, the Catholic University's
first on the run-off, was conducted from April 30 to May 3 and
has a margin of error of 2.47 percentage points. Polls from
Ipsos Apoyo and Datum consultancy are expected on Sunday.