IANAL but declaring a political leaning is not the same as supporting a candidate for public office. Many, many political 527s have an associated 501(c)3 or (c)

IANAL but declaring a political leaning is not the same as supporting a candidate for public office. Many, many political 527s have an associated 501(c)3 or (c)4 to handle donations for their charitable work, like the obviously left-leaning MoveOn.org.