May i have an explanation for this idiom
to be more of a drag than a driver on the ticket
I am assuming you are talking about the recent election in the US.
The presidential candidate chooses a running mate which he/she hopes will help him to get elected. If that VP candidate is not well received, he/she can "drag" down the effort to be elected. If this person is well liked, he/she can "drive" or "move forward" the effort.
There are those that said Sarah Palin affected John McCain's bid for the presidency.
Was she a "drag" on the ticket - or a "driver"?