FreedomWorks, which organized last year's Tea Party extravaganza in Washington, D.C. and is planning another rally on Sept. 12, is helping Beck's team with promotion and logistics.
To drive their point home, the "Restoring Honor" rally will feature King's niece Alveda King, who will discuss King's work and legacy.
"Uncle Martin's legacy is big enough to go around," King wrote in an op-ed in the Christian Science Monitor.
Most major Tea Party groups from across the country are supporting the rally, although some have reserved their backing.
Tea Party 365, one of the largest organized groups in the New York metro area, said it is not officially endorsing the rally, although some of its members were participating in it.
Tea Party groups deny the assertion that the rally is a reflection of their strength and numbers.
"I don't think it's intended to be a Tea Party rally or overtly political in any way," Meckler said. "It's not about politics or taking over Congress. It's about the concept of honor in America."
Nevertheless, in an economic climate where conservatives have seized on the Obama administration's policies and bombarded Democrats' on the stimulus and health care, the turnout is expected to be driven heavily by the politics of the moment.
The Republican establishment has distanced itself from the conservative commentator's rally amid concern that such close association could hurt the GOP.