Answer:
he cannot believe that many people cannot straight away choose one candidate.
Explanation:
In the article "Undecided", David Sedaris points out to those American voters who can't make up their mind to vote for the right candidate. In fact, Sadaris says that he can't actually believe such people exists in the country.
Sedaris is appalled by people's undecided decision when they have already seen or heard the campaigns of both the candidates. He says that voting system in the country is democratic and its civility is impressive.
However, he cannot believe that many people cannot straight away choose one candidate. Instead when the time comes for the actual voting, they end up choosing the wrong candidate.
