Beck is the guy exposing most of these stories of corruption, and the democrats have no idea how to counter him so far, other than to attack his "sanity". They are desperate to find a way to shut him up though.
I didn't get the whole frog thing either, but it was obvious right after he did it that it was fake; he said so immediately afterward. Even PETA said so, but they did ask him to say it on his next show because they were getting complaints.
Beck is an entertainer and makes his living off political commentary. But some of the things he's been reporting on are alarmingly true (screw that whole "Van Jones is an ex-communist" bit. Mussolini was an ex-communist too. Jones is a Marxist and racist who should never have gotten that position. He even said "The white polluters and the white environmentalists are essentially steering poison into the people of color communities because they don’t have a racial justice frame.”
I'd say most of the people who think Beck is a loony are people that never actually watch him except for certain bits on the internet. He hasn't become hugely popular because he's been lying. He's become hugely popular because he hasn't been afraid to expose Washington for what it is (that includes the Bush administration).