The Mantle of the Maverick Suits McCain
Article in The Contenders series profiles Sen John McCain, maverick Arizona Republican who has made his fight against the ways of Washington into the theme of his long-short bid for Presidency in 2000; even though he voted with Republican colleagues 81 percent of time in 1998, he alienated powerful constituencies on number of high-profile issues, prominently campaign finance; is trying to force his campaign-finance reform bill to floor for a debate that party leaders do not want; is playing off Gov George Bush's close embrace by Republican establishment and his extraordinary $36.3 million war chest; says his own campaign, which has raised $6.1 million, a distant second to Bush among Republicans, adheres to letter and spirit of his bill, which would ban unlimited and unregulated donations to political parties known as soft money--category in which Republicans have historically held edge; photos (L)

