With the fortunes of Cleveland’s NASA Glenn Research Center now heavily tied to President Bush’s plan to send astronauts to the moon and Mars, the upcoming election has the center’s employees and supporters watching for hints of the direction either candidate might take the nation’s space program. So far, both Sens. John McCain and Barack Obama have staked out positions that sound hopeful for the once-faltering Glenn center, and for the overall American space effort. In unusual detail for a presidential campaign, each candidate has pledged support for the moon- Mars exploration goal. Obama and McCain have promised, in principle, to provide the billions it will take to build new spacecraft, establish a permanent moon base, and propel astronauts to the rusty, intriguing surface of Mars.