washington u.s. democratic presidential candidate hillary clinton lead republican donald trump percentage point among likely u.s. voters monmouth university poll release monday day u.s. presidential election survey 802 register voters find 50 percent back clinton 44 percent support trump margin error plus minus 3.6 percentage point university say statement last poll release oct. 17 find clinton 12 point say several national opinion poll release early monday show clinton 3-point 4-point advantage monmouth poll 6-point clinton lead trump day u.s. election