He caved

Many commentators suggest that if a politicians would just be willing to change their minds on certain issues, they would be lauded as free thinkers who put the country ahead of party but that is not the way things work out. Those who change, admit they were wrong, are flip floppers or the most pejoratively, they caved. They lack principal and are willing to go whichever way the wind blows and just pandering for votes. Often times they just say they got the best deal and close out the issue. Just say you won and come home.