The protest march on Interstate 5 that plugged up southbound rush-hour traffic for almost an hour yesterday was just the first of several "surprise strategic strikes" aimed at changing the way law enforcement views black men, African-American leaders said. "This is just the inauguration, the beginning of a sustained effort to get the responses we've been seeking," said the Rev. Leslie Braxton, senior pastor at Mount Zion Baptist Church, while standing in the middle of the Madison Street offramp surrounded by at least 200 people. "We will continue this behavior until there are substantive changes. What you saw (yesterday) is...