1) Do you believe that this ruling will get overturned by the US Court of Appeals or the Supreme Court? Please state why.
No. This ruling is so heavily based on Romer v. Evans
that the US Supreme Court would effectively overturn that ruling in overturning this one. I don't think that is likely.
ACLU, et al v. Bruning (2005)2) Based on your first answer, what will this mean for gay marriage going forward? Will an overturning effectively halt the push for gay marriage? Will a affirmation of this ruling be the final word, allowing gay marriage through the US? Do you think this will ultimately lead to a Constitutional amendment banning such marriage, and would such an amendment pass?
Section 29 goes so far beyond defining marriage that the court can only conclude that the intent and purpose of the amendment is based on animus against this class ["This class", meaning homosexuals].
This case does not necessarily prohibit the legislation from enacting laws banning same-sex marriage. It will, most likely, have an effect on other similarly worded state DOMA's. 3) What political ramifications will this have? Will such a ruling play a significant part in the 2006 congressional elections?
Difficult to tell. The important question is what effect will this have on a Federal Marriage Amendment. One of the principal reasons for the Amendment's failure was that there hadn't been a successful challenge to State Marriage Amendments.