Currently they all have holding pages. Bloggerheads has quite a dossier on David Taylor the arch-Blairite.
Update: Anyone visiting the sites now get's redirected to Senator Johnson's site. This is a stitch up though and me, being a real Internet geek can prove it to you.
David Taylor has put a re-direction rule onto the Domain hosting server.
dizzy@slakbox:~$ host www.johnson4leader.org
www.johnson4leader.org has address 18.104.22.168
dizzy@slakbox:~$ host www.johnson.senate.gov
www.johnson.senate.gov has address 22.214.171.124
"126.96.36.199" is owned by Moving Edge based in Brighton. "188.8.131.52" is owned by the US government and hosted in... the US. Each of the www.jophnson4leader domains linked above resolve to a hosting page belong to a web company from Brighton. Each domain in DNS was regsitered by David Taylor on September 5th. Each domain's records are hosted on the same nameservers in the UK (ns1.domainmonster.com, ns2.domainmonster.com, ns3.domainmonster.com). The US Government does not host domain records on tinpot hosting companies. In fact you cannot even read .gov domain records on the Internet.
The fact that such a redirection has so suddenly been put in, and the fact that they've redirected to the US government, plus the claim that a .co.uk and org.uk have been registered last week on behalf of some obscure US Senator is nonsense.
Someone is clearly panicking.
Update 2: I'm sorry if I make people feel thick. I could spend days talking about DNS and domain names. I used to be a Hostmaster. David Taylor, or whoever it is, picked the wrong person to mess with.
Update 3: I just phoned David Taylor, he sounded unbelievably harrassed as if he's had a lot of phone calls already. When I asked him why he's gone for a simplistic hack to try and mask the reality of the domains he hung up on me.
Update 4: Oh look, the Domainmonster.com holding pages have re-appeared!