Tomorrow is primary day in New Jersey, where Chris Christie and Steve Lonegan square off for the Republican gubernatorial nomination. Most polls put Christie ahead pretty comfortably, but with an early-summer primary, turnout is expected to be light — so perhaps Lonegan can bring more motivated supporters to the polls.

A new poll out this morning shows the undecideds getting off the fence, and Christie remaining pretty solidly ahead. He’s increased from 39 percent to 46 percent; Lonegan has increased from 29 percent to 35 percent, and the undecideds have slid from 29 percent to 15 percent.

Christie has been the “establishment” candidate, and Lonegan has been trying to set himself up as the more conservative candidate. Democratic governor Jon Corzine’s allies made a move a few weeks ago to trash Christie, apparently thinking Lonegan is more beatable; at this point, both are beating the incumbent but Christie by a larger margin.

Christie has launched an anti-Lonegan ad “exclusively on Twitter.”