Mike McGinn has a response to the yesterday’s Nickels challenge. He identifies the funding sources and sketches out a $2.4 billion budget for surface/transit that fits the revenue. That’s more than you can say for the deep-bore tunnel, which is currently roughly $1 billion short in identified sources.
The Nickels campaign identified the surface/transit total cost as $3.5 billion. Looking at the chart, it appears the key discrepancy is that Nickels includes $1.1 billion for “Moving forward” projects (the work already underway on the North and South ends.)
It’ll take some more digging to resolve the discrepancy.