WASHINGTON - When two Russian immigrants and their American financial backer needed marketing help for their innovative electric motor, they turned to a merchant banker at one of the nation's largest investment houses - retired Army Gen. Wesley Clark. The meeting at the Washington office of Stephens Inc. in late 2001 proved fortuitous for both Clark, the former supreme commander of NATO, and the principals in WaveCrest Laboratories, at the time a small research and development company in Dulles, Va. "They hit it off pretty much right away," said WaveCrest spokesman Tom McMahon. Clark signed on as a consultant...