School choice, that is. Club for Growth has a public tiff with Mike Huckabee, but they did a white paper on each of the candidates left and right.
Summary: All of the Republicans are in favor in some fashion, and have a voting record to prove it – though Huckabee’s record is mixed, and Paul’s opposition to federal involvement per se perversely aligns him with the NEA opposing choice proposals.
On the Democratic side, CFG says “One of these candidates is not like the other …” though they do distinguish Edwards for proposing a national teaching college.
Club for Growth’s reports are linked from the sidebar on their home page, but I’ve extracted the relevant points on school choice here.