I've received this rumor by email several times and seen it on line in many locations.

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beware of planned staging of riots Fwd: Re: DHS WHISTLEBLOWER

Washington, DC – The Obama agents, through the DHS and other assorted colluders, are plotting a major ‘Reichstag’ event to generate racial riots and produce the justification for martial law, delaying the November 2012 elections, possibly indefinitely, a DHS whistleblower informed the Canada Free Press on Tuesday.
The ‘Reichstag Event’ would take the form of a staged assassination attempt against Barack Obama, “carefully choreographed” and manufactured by Obama operatives. It would subsequently be blamed on “white supremacists” and used to enrage the black community to rioting and looting, the DHS source warned.
The Obama administration would then use the violence and chaos they created as justification for the imposition of martial law in major urban cities in America, the creation of DHS checkpoints, restriction of travel, and the indefinite delay of the November 2012 elections.
The Reichstag event refers to a fire started during Hitler’s rise to power. The fire allowed him to grab emergency powers and murder his opposition. Historians have long believed that Hitler started the fire himself, while he blamed it on the Communists.
The anonymous whistleblower elaborated on how the Obama administration is using the Occupy movement, labor unions, and other assorted subversive groups to create massive chaos within the nation.
“Using untracked campaign funds, they are paying people to infiltrate the various movements to cause physical destruction of property and disrupt commerce. That began last year, but has increased ten-fold already this year,” the DHS source shared.
“Obama is using some high profile people as pawns to foment the revolution. I heard several times through very credible sources that [Louis] Farrakhan is on the CIA payroll. Other have been named as well, but I’m not prepared to identify them yet. Farrakhan is to coordinate the Blacks and the Muslims to prepare for riots this summer, using any means necessary.”
The recent revelations appeared to complement warnings given by other government insiders, who alleged that Jeremiah Wright, Van Jones, Al Sharpton, and Jesse Jackson were all agent provocateurs whose mission was to inflame racial tensions and spark open conflict in the streets of America.
According to the DHS source, a global economic collapse is coming, which the Obama administration is well aware of. They wish to build a system of global governance from the ashes of the previous financial system. In order for this mission to be completed, the Obama administration needs more time at the helm of power. Their reasons for concern are justified; as recently as May 8, influential political prognosticator Dick Morris predicted a Romney landslide if the election were held today.