Republican National Convention This episode's headline: Challenges Abroad; Historical Perspective. ANCHOR: JIM LEHRER; GUESTS: SEN. PAT ROBERTS; SEN. CHRIS DODD; MEENA BOSE; RICHARD NORTON SMITH; MICHAEL BESCHLOSS:; ANDY KOHUT; MARK SHIELDS; DAVID BROOKS CORRESPONDENTS: KWAME HOLMAN; RAY SUAREZ; SPENCER MICHELS; MARGARET WARNER; GWEN IFILL; TERENCE SMITH; KWAME HOLMAN