ABC’s Z. Byron Wolf reports: Scott Brown is proving to be an elusive vote on matters of cloture. During his month in the senate, Brown is just about evenly split, siding half the time with Democrats and half the time with Republicans. For a man ushered into the Senate as someone Republicans should “exalt in” and signaling the death knell of Democrats’ super-majority, Brown has shown himself to be no fan of Senate Republicans’ slow-everything-to-a-snail’s-pace strategy. In two cases now Brown joined several other Republican moderates to buck his party and help Democrats narrowly defeat filibuster. The most recent occurred...