Student or Learner
After Pranab Mukherjee held parleys with UPA allies, Prime Minister Manmohan Singh has joined the campaign and has played the consensus card straight on - The UPA-Left nominee should get the support of everybody, irrespective of party affiliation.
Please explain the highlighed ones.
The UPA-Left nominee = the nominated candidate for the UPA-Left [Party]
party affiliation = being affiliated to (connected to/having allegiance to) a political party.