A new Rasmussen Reports survey shows Barack Obama and Chris Christie in a dead-heat, 44%-43%.
That's the best showing of any '12 contender, according to Rasmussen's most recent surveys. Mitt Romney is the only other candidate to land in the margin of error against the POTUS, trailing him 44%-41%.
But Christie remains largely undefined to most voters with a 38%/27% favorability rating. 35% don't have an opinion of him.