Just as there are swing states in the United States election, so too are there players whose form will have a significant bearing on the make-up of the All Blacks squad for the Wales tour to be announced at the end of this month.
One of those swing players is Blues lock Patrick Tuipulotu, who will be closely monitored over the next few weeks for reassurance that he's returning to being the athlete he was before suffering serious injury in 2015.
Tuipulotu is a swing selection because, if he's included in the All Blacks squad at lock, it will affect who is picked as a loose forward.
By the end of 2014, Tuipulotu had established himself as a regular bench All Black. Coach Steve Hansen liked Tuipulotu's ball-carrying power and ability to charge up the middle and take the All Blacks over the gainline.
At 1.98m and 125kg, Tuipulotu is a big presence with the explosive power to make an impact in test football. He and Blues team-mate Charlie Faumuina were strong All Blacks bench cards that year, being thrown into the fray to get over the top of defences and sap them some more.