Premise:
"Despite its tactics, the National Party is slipping in opinion polls."
Hypothesis: Regardless of the National Party's effort, opinion polls show them losing ground.

yes

Premise:
"The Commission received comments on the proposed rule from 45 commenters."
Hypothesis: 45 people commented on the proposed rule.

yes

Premise:
"Who is devoting himself to enriching our popular culture with high art?"
Hypothesis: Who is working towards making award winning art?
it is not possible to tell