Arizona is proving a great example of why education tax credits have so much potential to expand over time compared with vouchers.

The state is facing budget shortfalls and some Democrats have demanded an end to the education tax credit program. So, is the program in mortal danger?

Nope. From an Arizona Republic news report:

Anyone who does [oppose the tax credits] could face an abrupt end to a political career because the program is so popular… Tinkering with the school-tax-credit donations is a political grenade, policy analysts say. “Voting against a tax credit can be seen as a vote to raise taxes,” said Michael Griffith, a school-finance expert for the Education Commission of the States, which tracks education-policy issues.… Arizona Superintendent of Public Instruction Tom Horne warned that “the constituency is too strong” in support of tax-credit donations to private and public schools. He cannot imagine legislators would change the credits to pull the state budget out of the red.

These quotes illustrate two extremely important differences between tax credits and vouchers.

One, vouchers are seen as government spending and welfare while tax credits are seen as tax cuts. When you cut a voucher program, you’re slashing spending. When you cut a credit program, you’re raising taxes. We’ve been saddled with wasteful and distorting tax credits for years because of this political dynamic. It can now be used to advantage.

Two, tax credits multiply the school choice constituency. A voucher program counts only voucher recipients as constituents. An education tax credit program counts recipients, donors, and scholarship organizations as constituents, adding not just numbers but individuals with more money and political influence to the category of active choice supporters.