If journalists talk about a dream ticket, they are referring to two candidates for political positions, for example President and Vice-President, or Prime Minister and Deputy Prime Minister, who they think will be extremely successful.
dream ticket in British English
noun
a combination of two people, usually candidates in an election, that is considered to be ideal
Examples of 'dream ticket' in a sentence
dream ticket
These four would make a powerful dream ticket.
Times, Sunday Times (2008)
If explosive action flicks float your boat then this could be a dream ticket.
Times, Sunday Times (2014)
They gave him the landscape gardener's dream ticket: a completely free hand.