Who is the official nominee for President of the Democratic party?

John Kerry, now officially the Democratic nominee for president, has started a two-week campaign trip across the United States. Senator Kerry will travel by bus with his choice for vice president, Senator John Edwards of North Carolina.
   The candidates left from Boston, Massachusetts, for the first stops in Pennsylvania, West Virginia and Ohio. These are among the so-called battleground states that could decide the winner of the election on November second. President Bush had a day of appearances Friday in Missouri ,Michigan and Ohio.
   President Bush speaking Friday in Springfield, Missouri. The Republican Party convention opens on August thirtieth in New York City. Delegates will nominate President Bush and Vice President Dick Cheney for a second term. National conventions take place every four years, before the presidential election.