U.S. Rep. Rob Andrews announced Tuesday that he is resigning from Congress after more than 23 years, a decision that could short-circuit a House Ethics Committee inquiry into whether the New Jersey Democrat used campaign donations for personal purposes. Andrews, who previously aspired to higher office, said the inquiry was not a factor is his resignation, which is effective Feb. 18. He is taking a job running the governmental affairs unit of a Philadelphia law firm where his wife has worked. …