As a new Monmouth University/Gannett New Jersey poll shows that Gov. Jon Corzine (D) gets low marks from New Jersey voters on most issues, his campaign has launched another negative attack on former U.S. Attorney Chris Christie (R). It shows the Republican nominee leaving a recent Congressional hearing that investigated no-bid contracts his office awarded.

It's notable that one week after a rally with President Obama, Corzine is still hammering away at what is a somewhat complicated set of allegations that ultimately tie Christie to the unpopular Bush administration. The new Monmouth "semi-annual report card" indicates he is unlikely to raise his standing with state voters.

His job approval stands at 38 percent among registered voters, and only 30 percent among independents and 53 percent among fellow Democrats. Asked if voters thought Corzine had any significant accomplishments, just 13 percent said he had "major accomplishments," while 49 percent said he had only minor accomplishments. A third -- 34 percent -- said he had no real accomplishments. Here are his letter grades on specific issues:

Cost Cutting: C-
Property Taxes: D+
Government Ethics: C-
Cost of Living: D
Schools: C
Level of Effort: C
Overall Grade: C-

The survey of 923 adults was conducted from July 9-14, and had a margin of error of +/- 3.2 percent.