if I can capture an 8% return on a long term insturement like a CD or Treasury Bond why would I want to be in the market?

To get 8% on a CD usually requires a pretty long term maturity. You would have to buy them so that the maturities would stagger every year for the 35 years you were planning on drawing. Personally, I think that's too much of a pain.

Treasury Bonds I am not familiar with, so I won't comment there.

If it were me, and I didn't want to take a ton of risk, I would keep it in some sort of index device (either a fund (like Vanguard) or trust (like SPY)).

If I wanted even less risk than that, I would find a way to live with a smaller draw. One that would allow you to put it all in a Money Market Fund, and live with barely beating inflation. That way, it is very liquid.

Just my $.02.