[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/images/07/31/art.obamaclinton.gi.jpg caption="Many Clinton backers feel the so-called 'dream ticket' is off the table."](CNN) - The grassroots group "VoteBoth" announced Thursday it is abandoning its efforts to land Hillary Clinton on the bottom half of the Democratic presidential ticket, a sign even the New York senator's most ardent backers now believe she has little chance of being named Barack Obama's running mate.
Reacting to reports that Barack Obama has tapped Clinton to speak at the party's convention Tuesday night - as opposed to the Wednesday-night slot traditionally reserved for the vice presidential candidate - VoteBoth founders Adam Parkhomenko and Sam Arora said in a letter to supporters it no longer makes sense to press for the one-time presidential candidate to be Obama's No. 2.
"Senator Hillary Clinton is no longer under consideration as Senator Obama’s running mate," Parkhomenko and Arora wrote. "While we all were working toward a different result, ultimately we and Barack Obama are working for the same eventual outcome - getting ready to take back the White House and bring our country the change Americans deserve and so desperately need. There is nothing more important than that."
Watch: What happened to Hillary?
Parkhomenko and Arora, both of whom once worked for Clinton, say they amassed more than 40,000 supporters in the course of their campaign.
Watch: Clinton makes case for Obama
In Thursday's letter, both also stressed the importance of supporting Obama's presidential bid, even if Clinton is not a part of his ticket.
"To those who are hesitant to support Obama right now, we urge you to keep giving him the chance to earn your vote. We are confident he will," they wrote. "Because, when it comes down to it, even the most ardent Hillary-supporter must ask himself or herself, 'Do I want John McCain sending our soldiers off to more wars, giving Big Oil free rein to gouge us at the pump, and letting ideology overrule decisions that should be made on the basis of science and health?'"