Breakdown of Nie mam wątpliwości: większość popiera ten pogląd.
ten
this (m)
większość
majority
popierać
to support (a view, a candidate), to endorse
pogląd
view / belief
Questions & Answers about Nie mam wątpliwości: większość popiera ten pogląd.
Why is wątpliwości used instead of the dictionary form?
Because of the verb phrase nie mam (I don't have). In Polish, when you negate having a direct object, that object must take the Genitive case. The dictionary form is the feminine noun wątpliwość (doubt), and its Genitive form is wątpliwości.
Is wątpliwości singular or plural here?
It can be either! For feminine nouns ending in a consonant like wątpliwość, both the Genitive singular and Genitive plural forms are exactly the same: wątpliwości. So this phrase translates equally well to 'I have no doubt' or 'I have no doubts'.
Does większość (majority) always take a singular verb like popiera?
Yes. Although 'majority' implies many people, the word większość is grammatically a singular feminine noun in Polish. Because of this, it must always be paired with a singular verb. This is different from English, where collective nouns can sometimes take plural verbs.
Why didn't ten pogląd (this view) change its ending, since it is the direct object?
It actually is in the Accusative case, but you cannot tell just by looking at it. For masculine inanimate nouns like pogląd, the Accusative form is identical to the Nominative (dictionary) form. The pronoun ten follows the same rule, so the whole phrase looks unchanged.