UPDATE 1 — Right — wing wave in Brazil's Congress boosts Bolsonaro camp ahead of presidential runoff

Bolsonaro's right-wing Liberal Party wins most seats in Senate and lower house With 28 seats, PL has biggest Senate presence for any party since 1985 Senator Bolsonaro stumped for Senate candidates, eyeing balance of power with Supreme Court (Updates paragraph 3 to reflect best performance in wake of Brazil's enacting its constitution in the late 1980s) By Fernando Cardoso, Ricardo Brito and Lisandra Paraguassu SAO PAULO/BRASILIA, Oct 5 (Reuters) — Brazil's right-wing Liberal Party, home to Senator Flavio Bolsonaro's presidential bid, emerged as the biggest winner in congressional elections on Sunday, securing the largest single-party representation in both the Senate and the lower house. Senator Bolsonaro, the eldest son of former President Jair Bolsonaro, on Sunday won the most votes in the first round of the presidential race, advancing to a runoff against leftist President Luiz Inacio Lula da Silva on October 25. During the campaign, the younger Bolsonaro stumped often for allied Senate candidates. His Liberal Party (PL) increased its representation in the Senate from 15 to 28 seats, the strongest result for a party since Brazil's constitution was enacted in the late 1980s,.