The track record of challengers who failed to lead after their conventions is not good.
It is usually the challengers who struggle to persuade entrenched incumbents to debate them.
The list of young challengers who have yet to win a major grows longer.
"You always see something like that from challengers who are outsiders trying to enter the system.
The anti-Museveni vote is splintered among seven challengers, who cannot compete with the president financially.
There may also be authorized "vote challengers" who can question a voter's eligibility.
Consider the contrast between two Republican Senate challengers who campaigned this past week with Trump.
I know there are guys at the Challengers who can play in the top level right now".
Mr Nazarbayev, who has been the leader of Kazakhstan since 1989, faced three challengers, who all expressed support for him.
An additional 114 incumbents ran against challengers who had raised less than $25,000, a study by Common Cause found.
Among the challengers who will try to put the heat on Weir is the 33-year-old Chopra.
