Yet Glenn has a long way to go. He is still struggling to fashion a political persona and a cogent platform of ideas upon which to campaign. And for all his nine years in Washington, the Senator is still better known as an icon of the Space Age than as a compelling leader whose speeches and legislation shape public and Congressional opinion. In fact, many Democratic leaders insist that unless Glenn can lift himself to that higher plane occupied by such masterful campaigners as John F. Kennedy and Ronald Reagan, he will be unable to convert his celebrity into enough votes to win the nomination.