Even if it were held, Mrs Plavsic may lack the resources to mount a credible campaign.
It remains decades away from being able to mount a credible military challenge to American pre-eminence.
Ms San Gil is one of the few who could mount a credible challenge to Mr Rajoy.
If the Republicans are able to mount a credible challenge, the contest for the seat will likely be expensive.
So, using Rae's testimony and the forensics, one can't mount a credible case that there was not cannibalism".
Once the press got on to the Hadera affair, the lethargic local police force was forced to mount a credible inquiry.
"It doesn't take much to mount a credible activity in the DRC," says Filip Reyntjens, an expert on the Great Lakes Region at the University of Antwerp.
But unless Mr Estrada's opponents can mount a credible last-minute challenge, uniting on an "Anyone But Erap" platform, he will win.
If Labour is to mount a credible opposition to Tory privatisation, it needs to draw a thick line under its own past.
"The Democrats that are known enough to mount a credible challenge are smart enough to know they won't win," he said.
Well-intentioned campaign finance laws have made it impossible for most challengers to raise enough money to mount a credible challenge.
