In a tweet, the leader of the Constitution Party noted that he had also called for a boycott of the 2010 election "to expose sham democracy," Ahram Online reported.
He added, "It's as if no regime was toppled."
ElBaradei was the second Egyptian political leader to call for a boycott of the April legislative elections.
On Tuesday, the Popular Current party said in a statement on its Facebook page that it "will not support a regime that has rebelled against all the goals of the January 25 Revolution, and the sacrifices of its martyrs and injured."
The party's leader, former presidential candidate Hamdeen Sabbahi, is also a founding member of the NSF.
In an interview with al-Jazeera, Mohamed El-Beltagy, the leading member of the Muslim Brotherhood, invited NSF leaders to a dialogue to reassure them about the transparency of the elections.