Suggested sound-bite for Democrats when talking about taxes: "Taxes should be as low as is possible, but as high as is necessary".
The first part puts you on the side of the angels and duplicates the Republican message. The second refreshes in people's minds the fact that taxes actually fulfill a purpose which many will agree with even as they grumble about paying the money.
As long as the debate is about just the first part then the "cut taxes" crowd will always win. Democrats need to re-educate the people that their taxes actually do pay for something useful. Once they do that then they need not always fear the "tax and spend" label.