One who brownnoses (flatters or humors somebody in an obsequious manner for personal gain); one who sucks up; a bootlicker, ass-kisser, sycophant.
One who uses obsequious compliments to gain self-serving favour or advantage from another; a servile flatterer.
One who seeks to gain through the powerful and influential.
To play the sycophant toward; to flatter obsequiously.