Those who choose to vote in the state’s Democratic Party Presidential Preference Primary will do so Saturday. Polls will be open from 7 a.m. to 7 p.m. at the same locations as the Republican primary a week ago. Democratic presidential candidates still in the race whose names will appear on the ballot Saturday are former New York U.S. Sen. and U.S. first lady Hillary Clinton; Vermont U.S. Sen. Bernie Sanders; and Dr. Willie Wilson, a Chicago, Ill., businessman.