[Petronski]

He pledged to back her, then he broke his word.

You admit you've never seen the pledge. You only have the self-serving claims of the party hacks who picked her.

[Mojave]

“Despite having signed a pledge to support the eventual nominee to emerge from the process, Hoffman considered the possibility of asking for the Conservative Party’s endorsement to run against Scozzafavva, making it a three way race.”

http://www.tcotreport.com/23ny1.html