Nearly 159 million Brazilians will head to the polling booths on Sunday to vote in general elections. They will elect their new MPs, see two-thirds of the Senate change ranks and, most importantly, vote for their next president.Though the vote is held by secret ballot, people wear their support on their sleeve. Candidates and parties are brandished on flags throughout the streets of #RiodeJaneiro, and business is booming for vendors selling merchandise for President Luiz Inacio Lula da Silva and