Look, Galloway is a ****, right? He certainly supports terrorist groups such as Hamas and Hizbollah. He supports dictators such as Assad and the Castros. He loves Ahmadinejad and is a declared supporter of the guy. He likes just about anyone who is against US and UK foreign and domestic policy. The latter wouldn't be so bad if it were principled as I am against a lot of UK and US foreign policy and think the people in charge of it are - at best - total clowns. But Galloway isn't even a principled opponent of US and UK foreign policy. He's someone who knows how to make himself some cash by being funded by all sorts of unsavoury regimes.
He is also someone who, like it or not, is very charismatic and knows a lot of stuff. He regularly makes mainstream politicians and media look like fools, not because he has "juvenile fans" flying from the mainstream to the fringes but quite obviously because the mainstream often is populated by know-nothing idiots and fools. Just look at people like Ed Miliband who is supposed to be the opposition to the ConDem government. When you have a hapless spastic like him trying to take on an obviously insincere bunch of tossers like the Conservative Party (read Charles Moore's "Even I... op.ed) and the Lib Dems (a party whose electoral platform was all based on opposing cuts etc...) then you can see why mainstream voters have nobody to vote for.
But before everyone starts crapping their pants (or demanding that others do), the UK is not going to go Nazi. Only people who are even more paranoid and juvenile than Galloway voters can think so.