I definitely back Walker; no problem here. I also like other candidates as well. If Trump should commit a big boo boo or otherwise, fade in the race, the top spot is open.
They don’t allow candidates in because they do poorly like Gary Johnson last time or Alan Keyes in the past, a great guy.
What would it accomplish to boycott the debate? That just means the next 3, Santorum, Kasich or whomever will now have a spot at the debate.
Trump is going nowhere, don't worry about it...people love his style because he is not afraid to say exactly what he means and to whoever is there to listen. As time goes by, one of the frontrunners (Walker) will edge forward and get the backing of the party and voters.