Rio residents will be sorely disappointed to learn that President Obama, the god who walks among men, has cancelled his sermon in the square.
AFP has the cancellation information:

The speech in the historic plaza known as Cinelandia, in the heart of Rio de Janeiro, “is cancelled,” an embassy spokeswoman told AFP.
Obama instead will deliver remarks at Rio’s Municipal Theatre, the official said, without specifying whether it would be open to the public or exclusively for invited guests.
The Brazilian masses will be crushed – absolutely crushed – because President Obama is universally adored in Brazil. Oh, wait, this just in:
On Thursday, members of an advance US security team were seen inspecting the surroundings of Cinelandia, where anti-US banners could be seen hanging from a road-side fence.
Some social and union groups have declared Obama a “persona non grata” and called for a protest, accusing him of a “bellicose policy of occupation” in foreign countries, and of attacking people “in the name of the war on terror.”
Apparently some of Brazil’s citizens don’t have access to the internet and have’t heard about the 2008 election. They still think George Bush is still President.
That’s the only possible answer, because, you know, all foreigners love President Obama.
Source: AFP