The Latest: Delaware has postponed its presidential primary election for a second time, moving it to July 7.

As the coronavirus pandemic upends the presidential campaign, states across the country have postponed primary elections and expanded vote-by-mail options, citing the difficulty of holding elections during the outbreak.

One state, New York, attempted to cancel its already-postponed presidential primary after the Democratic presidential race was settled, but a federal judge ordered that the election go forward in June.

Fifteen other states and two territories — Alaska, Connecticut, Delaware, Georgia, Hawaii, Indiana, Kentucky, Louisiana, Maryland, New Jersey, Ohio, Pennsylvania, Rhode Island, West Virginia and Wyoming, and Guam and Puerto Rico — have either pushed back their presidential primaries or switched to voting by mail with extended deadlines.

Some states have even postponed their primaries multiple times.

Several states have now conducted contests during stay-at-home orders, with many voters casting ballots by mail but some participating in person. Wisconsin forged ahead with its elections on April 7 after state Republicans blocked efforts to postpone voting there.