ALBUQUERQUE, N.M. — Four years ago, Heather Wilson gave up her House seat from New Mexico to make a run for a rare opening in the Senate. She lost in a bare-knuckled Republican primary. This year she has the luxury of sitting back as the Democratic successor to her House seat takes a similar gamble. ~~snip~~She still has one opponent, Las Cruces businessman and twice-losing congressional candidate Greg Sowards, but she is expected to win the primary easily. If she does, Wilson will face one of two young Democrats in November: Rep. Martin Heinrich, 40, who two years ago won...