A Leftist can be at one with Leftism. Or not.
Leftism cannot be at one with itself, because it cannot pay for the cost of what it wants to spend to help the poor.
A Conservative can be at one with Conservatism. Or not.
But Conservatism cannot be at one with itself, because its core virtue is freedom, yet it opposes freedom across a broad range of "social" issues, like abortion and gay marriage and recreational drug use.
An Objectivist can be at one with Objectivism. Or not.
Objectivism can be at one with itself. It has no internal contradictions.
Therefore only an Objectivist at one with Objectivism is perfectly at one, perfectly logical, without contradictions, coherent, with integrity.