DRYing some controller code

def index
     if not @contest.nil?
       @videos = Video.paginate( :all, :include => { :ad => :contest }, :page => params[ :page ],
         :conditions => [ "videos.state = 'published' AND contests.slug = ?", @contest.slug ] )
     else
       @videos = Video.paginate( :all, :conditions => { :state => 'published' }, :page => params[ :page ] )
     end
   end

   def parade
     if not @contest.nil?
       @videos = Video.paginate( :all, :include => { :ad => :contest }, :page => params[ :page ],
         :conditions => [ "videos.state = 'published' AND contests.slug = ?", @contest.slug ],
         :order => "ads.score DESC" )
     else
       @videos => Video.paginate( :all, :conditions => { :state => 'published' },
         :order => "ads.score DESC", :page => params[ :page ] )
     end
   end

@contest gets populated in a before_filter.
there's definitely too much repetition in here, how do you suggest cleaning up the whole thing ? I was thinking at building different conditions arrays inside the filter but I'm not so sure about it.
Suggestions ?

TIA,
   ngw