ALBANY — Sen. Charles Schumer has accepted thousands of dollars in campaign donations from convicted criminals, The Post has found. ... A Schumer aide said the senator will give all six of the crooks' contributions to charity. Campaign aides to Schumer's Republican opponent, upstate Assemblyman Howard Mills, noted that the latest disclosure comes after Schumer agreed to return nearly $20,000 to the federal government after billing taxpayers for 35 trips that were political in nature. "The more you know about Chuck Schumer, the more questions you have about how he conducts his affairs," said Mills campaign spokeswoman Caroline Quartararo.