President Jair Bolsonaro calls Brazil’s bicentennial Wednesday a chance to celebrate the nation’s proud history, but critics say he has transformed what should be a day of unity into a campaign event that they fear he will use to undermine next month’s election in Latin America’s fourth biggest democracy. Bolsonaro, who trails in polls before the Oct. 2 vote, has urged Brazilians to flood the streets, and tens of thousands of his supporters were expected to turn out in Brasilia, Sao Paulo and his hometown of Rio de Janeiro in a show of strength. The military planned displays in the capital and in Rio, with Bolsonaro attending.