OXON HILL, Md. (AP) — Returning to the national stage, Former Alaska Gov. Sarah Palin said Saturday that the Republican Party must broaden its message to grow.

‘‘We must leave no American behind,’’ she said in a populist speech that electrified supporters at a conservative summit in suburban Washington. ‘‘And we must share our powerful message of freedom and liberty to all citizens — even those who may disagree on some issues.’’