<sod >The Democratic presidential race remains unresolved as frontrunner Hillary Clinton and her dogged challenger, Bernie Sanders, contestedÃÂ two more tight primary races in Kentucky and Oregon.< eod>< sod > An increasingly contentiousÃÂ Democratic presidential race remainedÃÂ unresolved on Tuesday night, even as frontrunner Hillary Clinton edged past her dogged challenger, Bernie Sanders, with a wafer-thin primaryÃÂ victoryÃÂ in Kentucky.< eod>