Glory surfer
Someone who gets the glory from someone else's achievements. They dart around looking for ways to get recognition from others hard work. The surf the wave of glory without doing the hard yards themselves. The same person is likely to undermine the person who has actually put in the hard yards.
The politician was a real glory surfer, turning up to the Anzac day march just for the photo opportunity. After the photo shoot, he went back to his office and disproved funding for the monument stone to be refurbished.