Clark had a nice enough year in Triple-A last year, posting a .370 OBP. He has apparently made the Rangers as the backup second baseman. He has played some outfield in the past. And he runs.
He is an excellent sleeper, as Rotoworld points out here, in part because, contradicting what they say, Hank Blalock is not anything more than an emergency fill-in at 2B. No one thinks he makes the pivot well enough to play there regularly.
Clark is a name to put a star next to as a $1 end game flyer.