A Knoxville, Tenn. man admitted on Tuesday that he threatened the lives of Maricopa County, Ariz. sheriff Joe Arpaio and his family because he feared the lawman might undermine Barack Obama by questioning the legitimacy of his birth certificate — his eligibility to serve as president.(Snip)On Tuesday in a deal with prosecutors in Knox County, Tenn., Cox pleaded guilty to one count of harassment. According to KNXV-TV15, also in Phoenix, he will serve nearly a year in a “boot camp” program which is similar to probation. A court clerk told the TV station that Cox must also attend anger