I stated above, part of a plea requires the defendant to affirm that they were not coerced into the plea, because you can't legally waive your Constitutional right to trial under coercion, you would still retain that right if coerced. But how can the Courts accept that a threat of many more years of incarceration over your head is not a threat, and you weren't coerced by that into accepting a lessor plea? Plea deals are constitutionally invalid because they coerce defendants into giving up their constitutional right to trail with the threat of the 'trial tax' (a much much longer sentence if you DO go to court and exercise your Constitutional right).