Monday is the deadline to take advantage of an unusual opportunity to vote in Democratic and Republican primaries in the same year.

Those who voted in the Democratic presidential primary in February can still switch parties and vote in the June 3 Republican primary, or vice-versa. But to do so, they must file a change of party affiliation form by Monday. New Jersey is holding two primary elections this year. The first, on Feb. 5, was limited to picking a presidential nominee. Sen. John McCain won all of the state's delegates to the GOP convention while Sen. Hillary Clinton got most of the delegates to the Democratic National Convention.

On June 3, the Democratic and Republican parties will be nominating one candidate for U.S. Senate and a candidate for each of New Jersey's 13 seats in the House of Representatives, as well as candidates for local offices. Republicans will be electing 49 delegates to their national convention in Minneapolis-Saint Paul.