NEW HAVEN — Former Gov. John G. Rowland of Connecticut, who nearly a decade ago was forced to resign from office in disgrace, was found guilty in federal court on Friday of engaging in corrupt political acts even after serving prison time for his previous conviction.

The verdict came just one day after closing arguments and represented a second major downfall for the 57-year-old politician, who as a young man had been hailed as a rising star in the Republican Party.

Mr. Rowland was found guilty on seven counts, and faces a maximum sentence of 57 years in prison. He will be sentenced on Dec. 12 by Judge Janet Bond Arterton, who is known for being tough in public corruption cases.

For more than two weeks, jurors heard testimony regarding allegations that Mr. Rowland sought to inject himself illegally into two congressional campaigns in roundabout ways that would have concealed any payments for his work from campaign regulators and voters.