Here's StarIQ's description of her:
Ann Coulter was born with her Sun conjunct Mercury and Mars in expressive Sagittarius (December 8, 1961; Darien, CT; time unknown). From this combination, we can see that Coulter's identity or ego (Sun) is closely allied with her opinions (Mercury), which are fueled by aggressive Mars. Sagittarians naturally seek meaning in life, but when the Sun is afflicted, the tendency is to turn preachy or self-righteous.
Coulter's Mercury squares Pluto on one side and Pallas, the political asteroid, on the other. This t-square defines her relentless needling of her political adversaries. Mercury is also precisely octile (45ยบ) Saturn in Capricorn, which points to how her opinions were shaped by her formal Catholic, Republican roots. Saturn here defines her interest in American politics since it's exactly conjunct the U.S. Pluto, the nation's ruling planet.
However, her Venus in Sagittarius square Uranus wants a great deal of sexual freedom, while the square to Chiron can make her feel unattractive or inadequate. Coulter's short skirts help compensate for these feelings, as did her more youthful phase as a Deadhead. But as a professional, the strong Saturn influence limits her personal urges toward sexual quirkiness, and she's left criticizing that in other women.
