Well, it can protect you from a lot, that's for sure. But as a rule, pension costs have been rising for decades, and were underfunded even before the economy and tax revenues tanked. In this narrow column I can only highlight a few small pieces of hilarity, like pension plans borrowing cash to invest in real estate to the tune of a $1B loss (Calpers - http://online.wsj.com/news/articles/SB122947172015212225 - use a Google HTTP referer to read the full article). Or the plan where you borrow from your pension plan TO PAY FOR YOUR PENSION PLAN -- http://www.nytimes.com/2012/02/28/nyregion/to-pay-new-york-p...
So yeah, you've got a lot of clout, but you'd better hope that your city, state, or other relevant agency stays afloat or you're at risk of getting dinged a lot like an ordinary hard-working unentitled American.
(At least with a 401(k) or IRA, you know what assets you have and actually own them yourself -- moreover, if you worked somewhere small enough, they might be more diversified than your municipality's future tax revenue.)