BRIGHTON BEACH - Many Russian-Americans doubt the validity of Vladimir Putin's victory in Russia's presidential election. Putin won more than 60 percent of the vote over the weekend, but several Brooklyn residents with Russian roots have denounced the results. They, along with several political watchdog groups, say voter fraud and ballot stuffing likely led to his re-election. President Obama has since congratulated the Russian people for turning out in large numbers to vote, but is also calling for a full investigation into the fraud allegations.