Voters in more than a dozen states and territories will go to the polls or caucus sites on Super Tuesday, the biggest one-day prize of convention delegates.

Virginians can start voting at 6 a.m., while Democrats and Republicans in Colorado won't start caucusing until 9 p.m. Eastern time. The Associated Press and television networks may project winners as soon as the polls close in each state, many as early as 8 p.m.

Former U.S. Secretary of State Hillary Clinton is favored in opinion polls to win most of the Democratic contests, while businessman Donald Trump likewise is ahead in most Republican primary polls.

The biggest prize on Tuesday is Texas, which will send 251 Democratic and 155 Republican delegates to their parties' national conventions.

Texas is the home state of U.S. Sen. Ted Cruz, one of the GOP presidential contenders. The home state of Vermont Sen. Bernie Sanders, who is seeking the Democratic presidential nomination, also holds its primary Tuesday.

Other states where both parties will vote or caucus are Alabama, Arkansas, Georgia, Massachusetts, Minnesota, Oklahoma and Tennessee.

In addition, Alaska Republicans and American Samoa Democrats will caucus. Some Wyoming GOP district caucuses also will take place.

According to the Associated Press delegate count, Clinton leads Sanders, 544 to 85, with 2,383 needed to win the nomination. Clinton has received the greater share of endorsements from Democratic super-delegates, who include members of Congress and party leaders.

Trump leads among Republicans with 82 delegates, followed by the two U.S. senators elected with Tea Party support, Cruz with 17 and Marco Rubio of Florida with 16.

Here's the complete schedule of state, with opening and closing times (EST) for each:

Alabama, 8 a.m. and 8 p.m.

Alaska, 11 a.m. and midnight

Arkansas, 8:30 a.m. and 8:30 p.m.

Colorado, caucuses begin at 9 p.m.

Georgia, 7 a.m. and 7 p.m.

Massachusetts, 7 a.m. and 8 p.m.

Minnesota, caucuses begin at 8 p.m.

Oklahoma, 8 a.m. and 8 p.m.

Tennessee, 8 a.m. and 8 p.m.

Texas, 8 a.m. and 8 p.m. or 9 p.m.

Vermont, as early as 5 a.m. to 7 p.m.

Virginia, 6 a.m. to 7 p.m.

Wyoming, various times for caucuses

American Samoa, caucuses begin at 2 p.m.

Jonathan D. Salant may be reached at jsalant@njadvancemedia.com. Follow him on Twitter @JDSalant. Find NJ.com Politics on Facebook.