everyone claims the 7th is democratic, but really it can swing, and it will swing far to Frazier when he wins the primary. It just has been so democratic because the last two cycles we've had crappy candidates and it wasn't a good year not to mention Perlmutter just keeps raising money, this year that all changes
From What I can understand, the Western portion leans sort of Republican, but the Eastern portion, especially the heavily minority parts of Aurora, is what tilts it Democrat. Frazier is probably the best candidate the Republicans can hope for in that regard, as his tenure as mayor of Aurora should help him keep down Perlmutter's margins there.