WORCESTER, Mass. - Supporters of Republican Scott Brown lined the sides of a street here outside a Democratic rally at Worcester Polytechnic Institute where former President Bill Clinton came to campaign for Martha Coakley. More than 75 boosters of the GOP candidate turned out for the counter-rally, standing the sub-freezing weather to wave Brown signs and loudly sing (to the tune of "Battle Hymn of the Republic"), "Glory, Hallelujah . . . Send Scott Brown to D.C.!" Among the Brown supporters were - believe it or not - rank-and-file members of the Service Employees International Union.