SO I TRAVEL for eight hours overnight on a noisy, uncomfortable bus to join a massive antiwar protest in D.C. on Saturday, conservatively estimated as a crowd of 100,000 (and more, probably), and then, after miles of marching and another eight-hour ride back, I pick up The Sunday Globe and read a story on our protest on Page A6, just above a story of almost equal length about a couple of hundred counterprotesters. And lo, in Monday's Globe, there, given significant prominence, is a story on Page A2 with a picture about one-third the size of the page, ''400 rally...