Former Cook County circuit judge Jessica A. O’Brien was sentenced Thursday to a year and a day in federal prison for participating in a $1.4 million mortgage fraud scheme years before she took the bench.U.S. District Judge Thomas M. Durkin imposed the sentence after O’Brien, acting against the advice of counsel, gave a long and rambling statement.O’Brien described herself as an “embarrassment” to the voters who put her on the bench and repeatedly categorized her actions as “stupid.&rdquo …