The fact that he was invited is self evident that something has changed.
In the days he wrote that song the establishment considered him persona non grata.
He was as likely to be invited to the White House back then as Fidel Castro was.
Anyway, a while back we mentioned that the 4th Fleet had been resurrected from a mothball death to be sent to "purtek Amurka" down south where the oil is.
Brazil and neighbors have come into an oil boom of sorts, so MOMCOM thinks they need some "protection".
What has changed is that those nations, facing the business end of the barrels of the 4th Fleet boomers, are not dancing to MOMCOM songs right now.
In fact, Brazil even after being threatened with MOMCOM might has stood up:
Brazil rebuffed a U.S. appeal for new sanctions on Iran over its nuclear program, vowing during a visit from U.S. Secretary of State Hillary Rodham Clinton not to "bow down" to gathering international pressure.(Huffington Post). Other South American nations, now of more interest to MOMCOM due to their oil holdings, are also outspoken against her.
Brazilian President Luiz Inacio Lula da Silva pre-empted Clinton even before she could make the case for new United Nations Security Council penalties. Silva is an outspoken opponent of sanctions, and his country currently sits on the Security Council, which will be asked to approve its toughest-ever penalties on Iran later this year.
The cards are all on the table, then, so now we watch to see who has the poker hand and who has the bluff.