PORTLAND, Ore. — The Lakers were halfway to their fourth consecutive loss after a poor defensive effort tonight against the Portland Trail Blazers, a possible first-round playoff opponent. The Trail Blazers made 22 of 40 shots (55 percent) in the half, including 13 of 20 during the second quarter (65 percent). Kobe Bryant countered by hitting four consecutive 3-pointers in the closing moments of the second quarter to help the Lakers trim a 12-point deficit to six by halftime. Bryant scored 18 points on 7-for-13 shooting..