Filed at 1:55 p.m. ET

NEW ORLEANS-- Former Sen. Rick Santorum is telling fellow Republicans that the party failed the conservative movement when the GOP controlled Congress and the White House.

Santorum is one of several potential presidential candidates who addressed the Southern Republican Leadership Conference, a three-day gathering of GOP activists.

The former Pennsylvania senator says some Republicans were guilty of growing the size of government earlier this decade.

''Conservatives didn't fail America,'' he said. ''Conservatives failed conservatism.''