here's some (but not all) the facts on taxes...
McCain vs Obama on taxes - Fact Checker
mccain wants to keep the bush cuts, cut a few more taxes and give 2.5k-5k to individuals for health insurance. big on nuclear plants which lead to cheaper energy (and if someone finally decides to create sane nuclear fuel policy reduces the amount of radioactive waste to nothing and makes it even cheaper, probably not happening short term though).
obama wants to expire the bush cuts (would would be the largest tax increase by value since WWII, but only the 5th largest increase by Gross National Product, which is a better indicator), increase capital gains taxes from 15 to 20%, increase taxes quite a bit on those making over 250k a year, and also offer credits to those needing health insurance. he also wants to decrease costs of health insurance with more/stricter regulation (but i strongly doubt that that happens).
obama is thinking in a much shorter term about fixing income inequality, but in the long term its hard to say that increasing the penalty for investing is a good idea. mccain's increasing tax cuts beyond bush may not be the greatest idea either. both want emission credits for polluters, which definitely isn't perfect, but i guess it's better than nothing (florida already does something like that, at least with eglin afb, where they track all use of hazmats and report it, then pay a fee per year for the total pollution created by the base).
but if you really wanted to save money, you'd increase the military to where it was before BRAC and clinton hit it instead of wasting SOOO much more money on contractors. A contracted termite exterminator makes 120k a year in iraq, an army exterminator makes 25k (closer to 40-50k with all bonuses etc). with what we've spent on contractors over the price of the old bigger military, we could have kept the bigger military for 25 more years and still be ahead. terrible economic decision.
farm subsidies is another economic issue that could easily save money, since so many people with no business in agriculture use it as a tax shelter (celebs, bankers, etc). it's like rich person welfare, only it's a lot more money, and none of the non-farmers (and a lot of corporate farmers) don't actually need it. MUCH smaller scale though than the above.