Why is he a “defective candidate?”
Oberweis is a less intelligent version of Mitt Romney. He changes positions every election cycle. For example in 2002, Oberweis compared pro-life Catholics to the Taliban and favored gun control and gay rights. Then in 2004, he supported an anti-gay marriage amendement and decried the illegal immigrant invasion. The local paper exposed the fact that Oberweis worked with a contractor who hired illegals. The media jumped on him for being dishonest about his positions.
Plus, Oberweis has a habit of attacking his primary opponents as being dirty RINOS and phony conservatives. While, portraying himself as the only true conservative. Despite the fact, he morphed from a RINO to Pat Buchanan clone in spawn of 6 years.
In addition to the points raised in Postin #6, Oberweis has an arrogant and abrasive manner which puts off voters.