Peruvians are expected to favor Keiko Fujimori in the first round of a presidential election on Sunday, although critical voters who have not forgiven the authoritarian rule of her father are likely to ensure a June runoff.

The U.S.-educated former congresswoman has worked to distance herself from imprisoned former President Alberto Fujimori after she lost the 2011 election. A center-right politician, she has vowed to preserve democracy and keep 25 years of free-market policies intact.

The 40-year-old Fujimori enjoys a double-digit lead, but is believed to be about 10 percentage points short of the simple majority needed for an outright win. Support for her slipped after tens of thousands protested against her on April 5, 24 years after her father shut Congress with the support of the army.