But perhaps the Republicans will have a credible candidate to take on the president.

If we want real debates during the general campaign, then only credible candidates should take the stage now.

For the first time, it was not clear what the outcome would be, and voters were given a choice among four credible candidates.

He is a credible candidate who will lead us to the land of milk and honey.

"I have a hard time thinking she will be able to turn herself into a credible candidate on foreign policy by 2012," says Mann.

For the Democrats it comes out in the degree to which any credible candidate has to appeal to black voters.

But no credible candidate has yet emerged from the east.

He also said that to hold the debate would acknowledge there were two credible candidates in the race.

"That we have three strong, credible candidates now shows how successful we've become."

In states where you've got more than one credible candidate, they need to be careful.