Bachmann had been polling consistently at four percent in the primary since she was added to the UNH poll in early May, garnering the same percentage in three consecutive surveys. The percentage of Republican voters who view Bachmann favorably has doubled -- from 26 percent to 52 percent -- since the early May poll, while the percentage who have an unfavorable opinion of Bachmann has actually dropped from 29 percent to 23 percent. The poll was the first taken by the UNH Survey Center since a June 13 N.H. debate where Bachmann received widespread praise for her performance. Romney remains the odds-on favorite in the Granite State: 68 percent of Republican voters have a favorable opinion of him, while only 24 percent view him unfavorably. Still, that is down slightly from a 70 percent-21 percent split in early May. Huntsman and Pawlenty have struggled to gain traction in the state. While the percentage of New Hampshire Republican voters who have a favorable opinion of Huntsman has increased from 9 percent to 19 percent in the last two months, the percentage who view him unfavorably has jumped by a similar margin: from 12 percent to 23 percent. Pawlenty's favorable rating, meanwhile, has remained virtually steady over the past two months (38 percent in early May, 39 percent in Tuesday's poll). But the percentage who have an unfavorable opinion of Pawlenty has increased from 12 percent to 20 percent. The poll also shows Romney with a slight lead over President Obama among all likely voters, 47 percent to 43 percent. In late April, Romney led Obama, 50 percent to 43 percent. Obama leads Bachmann, 47 percent to 41 percent. The president also leads Pawlenty, 47 percent to 38 percent, up from a 45-percent-to-38-percent lead in late April. UNH surveyed 729 likely voters, for a margin of error of +/- 3.6 percent. The margin of error among the subsample of likely Republican primary voters was +/- 5.2 percent.