[cnn-photo-caption image= http://i.cdn.turner.com/cnn/2008/images/06/04/art.unity.gi.jpg caption="Democratic leaders are urging Superdelegates to make their preference known."] (CNN) - In a bid for unity upon the conclusion of the prolonged presidential primary season, Democratic leaders on Wednesday urged all undeclared superdelegates to make their preference known by the end of the week.
In a statement released jointly by Senate Majority Leader Harry Reid, House Speaker Nancy Pelosi, Democratic Governors Association Chairman Joe Manchin, and Democratic National Committee Chairman Howard Dean, the leaders said it's now time to turn the party's attention toward the general election fight against Republican John McCain.
"To that end, we are urging all remaining uncommitted super delegates to make their decisions known by Friday of this week so that our party can stand united and begin our march toward reversing the eight years of failed Bush/McCain policies that have weakened our country," the statement said.
According to CNN's estimate, 145 superdelegates remain undeclared. Barack Obama has support from 394 superdelegates, while Hillary Clinton has 286 in her camp.