WASHINGTON (AP) — Call 'em the comeback crew.Republican Sen. Dan Coats and Democratic Sen. Frank Lautenberg served years in the Senate before bowing out because of a term-limits promise or the frustration of endless fundraising. They then discovered they couldn't quit the place.Pleas from party leaders and the opportunity to return lured them back. Now in their second acts, they could be joined by a third lawmaker — former Democratic Sen. Bob Kerrey. The onetime Nebraska governor and two-term senator left Washington in January 2001.Kerrey faces an uphill fight in trying to win the seat that Democrat Ben Nelson is leaving at the end of the year. Nebraska is a strong Republican state.All told, 35 senators have served nonconsecutive terms since 1913.