The New York Times > Opinion > Editorial: John Kerry for President: Senator John Kerry goes toward the election with a base that is built more on opposition to George W. Bush than loyalty to his own candidacy. But over the last year we have come to know Mr. Kerry as more than just an alternative to the status quo. We like what we've seen. He has qualities that could be the basis for a great chief executive, not just a modest improvement on the incumbent. We have been impressed with Mr. Kerry's wide knowledge and clear thinking - something that became more apparent once he was reined in by that two-minute debate light. He is blessedly willing to re-evaluate decisions when conditions change. And while Mr. Kerry's service in Vietnam was first over-promoted and then over-pilloried, his entire life has been devoted to public service, from the war to a series of elected offices. He strikes us, above all, as a man with a strong moral core.